Question

8400÷23,除以21x920÷50的巧算是什么

Answer 1

乘除法的规则告诉我们，除以一个数就等于乘以这个数的倒数。简便计算，可以利用乘法交换律和结合律.，分配率
8400÷23÷21×920÷50
=8400×920÷ 50 ÷23÷21
=8400×920÷ （100÷2）x1/23x1/21
=8400×920÷ 100x2 x1/23x1/21
=8400×920x1/ 100x2 x1/23x1/21
=8400×1/100x1/21x920x2 x1/23（乘法交换律）
=84x1/21x920x2 x1/23
=4x2x920x1/23
=8x920x1/23
=8x(920x1/23)（乘法结合律）
=8x40
=320

Answer 2

8400÷23÷21×920÷50
=8400×920÷ (23+21+50)
=7728008÷94
≈82212.77