75×13 75×68 75的简便运算不是86而是68?

2025-04-30 00:11:09
推荐回答(1个)
回答1:

75ⅹ13+75x68+75
=75ⅹ(13+68+1)
=75x(80+2)
=75ⅹ80+75x2
=6000+150
=6150