Question

91×32-91的简便运算？

Answer 1

91x32-91
=91x（32-1）
=91x31
=（90+1）x31
=2790+31
=2821

Answer 2

91×32-91利用乘法的分配律
=91×（32－1）
=91×31
=91×（30+1）再利用一次乘法的分配率
=91×30+91
=2730+91
=2821

Answer 3

91×32-91的简便运算如下：
91×32-91
=91×30+91+91-91
=2730+91
=2821

Answer 4

=91X（32-1）
=91X31
=（90+1）X31
=90X31+1X31
=2790+31
=2821

Answer 5

这道题的简便运算如下：
91×32-91
=91×32-91×1
=91×（32-1）
=91×31
=91×（30+1）
=91×30+91×1
=2730+91
=2821