思路清晰点:25m/匹雀渗歼总数550m1 要使最后单位为匹那就要550m/(25m/匹)=22匹【注意单位的运算】2 550m*4匹喊友/100M=22匹你看单位运算是对的再其次看看550m*4匹/100M=550m*(4匹/100M)=550m*1匹/25m和前面的550m/(25m/匹)、是一样的顷冲
对的啊,如兆简李果说一共有族迟xM的布,就是有x/25匹吧咐迟,不就等于4*x/100么~~~!!
100/4=25!!