36×(4/1-9/5+12/7)=
问题描述:
36×(4/1-9/5+12/7)=
答
“/” 前为分子,后为分母
36x(1/4--5/9+7/12)
=36x 1/4--36x 5/9+ 36x 7/12
=9--20+21
=10
此题应用了乘法分配律
答
36×(4/1-9/5+12/7)
=36×4/1-36x9/5+36x12/7
=9-20+21
= -11+21
=10