奇怪的分式 上小学的时候，小明经常自己发明新算法。

package org.bluebridge.topics;//思路：拿例子来说，1/4 * 8/5 = 8/20  那么验证 8/20 == 18/45  就是验证 8*45 == 20*18public class StrangeFraction {public static void main(String[] args) {int count = 0;for (int i = 1; i <= 9; i++) {for (int j = 1; j <= 9; j++) {for (int k = 1; k <= 9; k++) {for (int l = 1; l <= 9; l++) {if (i == j || k == l)continue;// 验证int leftup = i * k, leftdown = j * l;int rightup = i * 10 + k, rightdown = j * 10 + l;if (leftup * rightdown == leftdown * rightup)count++;}}}}System.out.println(count);}}