Question

数学计算题9分之4*[4分之3-（10分之3+4分之1）] 27分之16*7分之1+21分之5*7 0.2=1-24分之

Answer 1

【参考答案】

1、 4/9×[3/4 -(3/10 +1/4)]

=4/9×[3/4- 3/10 -1/4]

=4/9×[1/2 -3/10]

=4/9×[5/10 -3/10]

=4/9× 1/5

=4/45

2、 16/27 ×1/7+ 5/21×7

=16/27 ×1/7+ 5/21× (1/7×49)

=16/27× 1/7+ 35/3 ×1/7

=(16/27+ 35/3)× 1/7

=331/189

3、 0.2=1- x/24

0.8=x/24

x=24×0.8

x=19.2