简算。口算。

2024-12-28 16:45:35
推荐回答(2个)
回答1:

85-84又7/8÷7
=85-84÷7-7/8÷7
=85-12-1/8
=72又7/8

5/17÷1又1/2+1/3÷3又2/5
=5/17×2/3+1/3×5/17
=5/17×(2/3+1/3)
=5/17×1
=5/17

回答2: