[从头学数学] 第145节 一次函数 小结与复习题

剧情提要：
[机器小伟]在[工程师阿伟]的陪同下进入了筑基中期的修炼，
这次要修炼的目标是[一次函数 小结与复习题]。

正剧开始：

星历2016年03月21日 15:00:03, 银河系厄尔斯星球中华帝国江南行省。
[工程师阿伟]正在和[机器小伟]一起研究[一次函数 小结与复习题]。

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);config.setSector(5,5,4,1);  config.axis2D(0, 0,260, 2);  var scale = 2 * r;//x, y轴每一格的增量var spaceX = 4, spaceY = 100;config.axisSpacing(0, 36, spaceX, scale, 'X');config.axisSpacing(0,600, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];          for (var i = 0; i <= 36; i+=4) {              a.push([i, 100+10*i]);          }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  </span>

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);//config.setSector(5,1,4,1);  config.axis2D(0, 0,180, 1.5);  var scale = 2 * r;//x, y轴每一格的增量var spaceX = 2, spaceY = 2;config.axisSpacing(-10, 10, spaceX, scale, 'X');config.axisSpacing(-10,10, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];          for (var i = -10; i <= 10; i++) {              a.push([i, 2*i+6]);          }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  </span>

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);//config.setSector(5,1,4,1);  config.axis2D(0, 0,180, 1.5);  var scale = 2 * r;//x, y轴每一格的增量var spaceX = 2, spaceY = 2;config.axisSpacing(-10, 10, spaceX, scale, 'X');config.axisSpacing(-10,10, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];          for (var i = -10; i <= 10; i++) {              a.push([i, 1/2-2/3*i]);  b.push([i, 3*i-2]);        }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  plot.fillText('y=1/2-2/3x', a[a.length-1][0]+10, -a[a.length-1][1], 200);                 b = transform.scale(b, scale/spaceX, scale/spaceY);        tmp = [].concat(b);          shape.pointDraw(tmp, 'blue');          tmp = [].concat(b);          shape.multiLineDraw(tmp, '#22CCFF');plot.fillText('y=3x-2', b[12][0]+10, -b[12][1], 200);</span>

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);//config.setSector(5,1,4,1);  config.axis2D(0, 0,180, 1.5);  var scale = 2 * r;//x, y轴每一格的增量var spaceX = 2, spaceY = 2;config.axisSpacing(-10, 10, spaceX, scale, 'X');config.axisSpacing(-10,10, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];  var labelIndex = 0;        for (var i = -10; i <= 10; i++) {              a.push([i, i+1]);  b.push([i, 13/5*i-9/5]);        }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  labelIndex = 2;plot.fillText('y=x+1', a[labelIndex][0]+10, -a[labelIndex][1], 200);                 b = transform.scale(b, scale/spaceX, scale/spaceY);        tmp = [].concat(b);          shape.pointDraw(tmp, 'blue');          tmp = [].concat(b);          shape.multiLineDraw(tmp, '#22CCFF');labelIndex = 8;plot.fillText('y=13/5x-9/5', b[labelIndex][0]+10, -b[labelIndex][1], 200);</span>

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);//config.setSector(5,1,4,1);  config.axis2D(0, 0,180, 1.5);  var scale = 2 * r;//x, y轴每一格的增量var spaceX = 2, spaceY = 2;config.axisSpacing(-10, 10, spaceX, scale, 'X');config.axisSpacing(-10,10, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];  var labelIndex = 0;        for (var i = -10; i <= 10; i++) {              a.push([i, 3*i-15]);  //b.push([i, 13/5*i-9/5]);        }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  labelIndex = 16;plot.fillText('y=3x-15', a[labelIndex][0]+10, -a[labelIndex][1], 200);</span>

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);//config.setSector(5,1,4,1);  config.axis2D(0, 0,180, 1.5);  var scale = 2 * r;//x, y轴每一格的增量var spaceX = 2, spaceY = 2;config.axisSpacing(-10, 10, spaceX, scale, 'X');config.axisSpacing(-10,10, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];  var labelIndex = 0;        for (var i = -10; i <= 10; i++) {              a.push([i, 2+0.5*(i-1)]);  //b.push([i, 13/5*i-9/5]);        }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  labelIndex = 16;plot.fillText('y=2+0.5(x-1)', a[labelIndex][0]+10, -a[labelIndex][1], 200);</span>

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);config.setSector(5,5,4,1);  config.axis2D(0, 0,260, 2);  var scale = 2 * r;//x, y轴每一格的增量var spaceX = 100, spaceY = 500;config.axisSpacing(0, 1200, spaceX, scale, 'X');config.axisSpacing(0,3000, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];  var labelIndex = 0;        for (var i = 100; i <= 1200; i+=100) {              a.push([i, 3000-2.5*i]);  //b.push([i, 13/5*i-9/5]);        }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  labelIndex = 4;plot.fillText('y=3000-2.5x', a[labelIndex][0]+10, -a[labelIndex][1], 200);</span>

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);config.setSector(5,5,4,1);  config.axis2D(0, 0,260, 2);  var scale = r;//x, y轴每一格的增量var spaceX = 2, spaceY = 2;config.axisSpacing(0, 20, spaceX, scale, 'X');config.axisSpacing(0,20, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];  var labelIndex = 0;        for (var x = 0; x <= 20; x+=2) {              a.push([x, 20-2*x]);  b.push([x, 4*(10-x)]);        }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  labelIndex = 7;plot.fillText('y=20-2x', a[labelIndex][0]+10, -a[labelIndex][1], 200);                 b = transform.scale(b, scale/spaceX, scale/spaceY);        tmp = [].concat(b);          shape.pointDraw(tmp, 'blue');          tmp = [].concat(b);          shape.multiLineDraw(tmp, '#22CCFF');labelIndex = 2;plot.fillText('y=4*(10-x)', b[labelIndex][0]+10, -b[labelIndex][1], 200);</span>

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);config.setSector(5,1,4,1);  config.axis2D(0, 0,260, 1);  var scale = r;//x, y轴每一格的增量var spaceX = 2, spaceY = 2;config.axisSpacing(-20, 20, spaceX, scale, 'X');config.axisSpacing(-20,20, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];  var labelIndex = 0;        for (var x = -21; x <= 20; x+=2) {              a.push([x, Math.abs(x-1)]);  b.push([x, Math.abs(x+3)]);        }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  labelIndex = 15;plot.fillText('y=|x-1|', a[labelIndex][0]+10, -a[labelIndex][1], 200);                 b = transform.scale(b, scale/spaceX, scale/spaceY);        tmp = [].concat(b);          shape.pointDraw(tmp, 'blue');          tmp = [].concat(b);          shape.multiLineDraw(tmp, '#22CCFF');labelIndex = 20;plot.fillText('y=|x+3|', b[labelIndex][0]+10, -b[labelIndex][1], 200);</span>

<span style="font-size:18px;">var r = 20;config.setSector(1,1,1,1);  config.graphPaper2D(0, 0, r);config.setSector(5,1,4,1);  config.axis2D(0, 0,260, 1);  var scale = r;//x, y轴每一格的增量var spaceX = 2, spaceY = 5;config.axisSpacing(0, 12, spaceX, scale, 'X');config.axisSpacing(0,30, spaceY, scale, 'Y');var transform = new Transform();        var a = [];          var b = [];          var c = [];  var labelIndex = 0;        for (var x = 6; x <= 12; x++) {              a.push([x, 10*(x-8)]);  b.push([x, 40*(x-9.5)]);        }    a = transform.scale(a, scale/spaceX, scale/spaceY);        var tmp = [].concat(a);          shape.pointDraw(tmp, 'red');          tmp = [].concat(a);          shape.multiLineDraw(tmp, 'pink');  labelIndex = 0;plot.fillText('y=10*(x-8)', a[labelIndex][0]+10, -a[labelIndex][1], 200);                 b = transform.scale(b, scale/spaceX, scale/spaceY);        tmp = [].concat(b);          shape.pointDraw(tmp, 'blue');          tmp = [].concat(b);          shape.multiLineDraw(tmp, '#22CCFF');labelIndex = 5;plot.fillText('y=40*(x-9.5)', b[labelIndex][0]+10, -b[labelIndex][1], 200);</span>

本节到此结束，欲知后事如何，请看下回分解。