Question

3.45×2.8+2.8×5.55×2.8简便计算怎么做？

Answer 1

3.45×2.8+2.8+5.55×2.8
简便计算怎么做？
3.45×2.8+2.8+5.55×2.8
=(3.45+1+5.55)x2.8
=10x2.8
=28

Answer 2

最后应该是+2.8，原式=2.8×（3.45+5.55+1）=2.8×10=28

Answer 3

题目应该是像下面这样，你抄错了对吗？
3.45×2.8+2.8×5.55+2.8
=3.45×2.8+2.8×5.55+2.8×1
=(3.45+5.55+1)×2.8
=(9+1)X2.8
=10X2.8
=28

Answer 4

这种题就是观察，有公因式先提取公因式
=2.8×（3.45+5.55+1）
=2.8×10
=28

Answer 5

可以提取公因数，是2.8乘以（3.45+5.55+1）等于2.8乘以10等于28