Question

4.7×2.14+5.3×21.4如何用简便方法计算

Answer 1

4.7×2.14+5.3×2.14
=2.4×（4.7+5.3）
=2.4×10
=24

Answer 2

=4.7×2.14+53×2.14 =(4.7+53)×2.14 =57.7×2.14 =123.478

追答

我的对，他们的都不对

应该是=4.7×2.14+5.3×21.4第一部错了，下面的对了

Answer 3

 

Answer 4

=4.7*2.14+53*2.14
=2.14*（4.7+53）
=2.14*57.7
=123.478

Answer 5

把21.4缩小2.14