21×2⼀3乘以(9×1⼀7)简便运算?

2025-03-10 21:08:36
推荐回答(2个)
回答1:

21×2/3×9×1/7
=21×1/7×9×2/3
=3×6
=18

回答2:

简便计算
21×2/3x(9×1/7)
=21x1/7x(2/3x9)
=3x6
=18