81加9乘以91怎么简便计算

2025-04-18 05:07:31
推荐回答(2个)
回答1:

解: 81+9*91
=9*9+9*91
=9*(9+91)
=9*100
=900

回答2:

81+9x91
=(9x9)+9x91
=9x9+9x91
=9x(9+91)
=9x100
=900.