87X37 64x84-87简便方法?

2024-11-25 04:18:06
推荐回答(3个)
回答1:

算式中的84应为87吧?!
87×37+64×87-87
=(37+64-1)×87
=1000×87
=8700

回答2:

87X37+ 64x87-87
=87x(37+64-1)
=87x100
=8700

回答3:

87X37+64X84-87
=87X(37+64-1)-64X3
=87X100-192
=8700-200+8
=8508