2.1×(5.2+3.8)简算应该怎么写?

2025-06-27 23:29:16
推荐回答(3个)
回答1:

2.1X(5.2+3.8)
=(2十0.1)x9
=18十0.9
=18.9

回答2:

2.1×(5.2+3.8)=2.1x9
=2.1x(10-1)
=2.1x10-2.1
=21-2.1
=18.9

回答3: