Question

12/15乘以括号里的5/6+3/4括起来加5/4。怎样简便怎样算

12/15乘以括号里的5/6+3/4括起来加5/4。怎样简便怎样算

Answer 1

12/15乘以括号里的5/6+3/4括起来加5/4
4/5*(5/6+3/4)+4/5
=4/5*(10/12+9/12)+4/5
=4/5*(19/12+1)
=4/5*31/12
=31/15

Answer 2

用乘法对加法的分配律可以简便一些。

（12/15)X[(5/6)+(3/4)]+5/4
=(12/15)X(5/6)+(12/15)X(3/4)+5/4
=(2/3)+(3/5)+(5/4)
=40/60+36/60+75/60
=151/60。