39x54 47x39-39简便运算怎么写?

2025-04-07 08:14:07
推荐回答(2个)
回答(1):

简便计算
39x54 +47x39-39
=(54+47-1)x39
=100x39
=3900

回答(2):

39×54+47×39-39
=39×(54+47-1)
=39×100
=3900