Question

[1-5分之4除以(15分之2+3分之2)]乘13分之7怎么算 要用简便算法

Answer 1

7/9*5/11+4/9*5/11-5/9*5/11

=(7/9+4/9-5/9)*5/11

=6/9*5/11

=10/33

你们的题目应该是能简算的要简算把

1-4/5/(除号）(2/15+2/3)*7/13

=1-4/5/(除号)4/5*7/13

=1-1*7/13

=1-7/13

=6/13

纯手打

累啊