21×67+21×34-21的简便计算怎么做?

2025-04-24 22:45:43
推荐回答(3个)
回答1:

简便方法如下:
21×67+21×34-21
=21×(67+34-1)
=21×100
=2100

回答2:

21÷67+21×34-21
=(34+67-1)×21
=100×21
=2100

回答3:

21X67+21X34-21
=21X(67+34-1)
=21X100
=2100