Question

3.1×6.4+13.8×3.2怎么简便运算？

Answer 1

解，我们可以把13.8写成6.9＊2.所以有
原式=3.1＊6.4+6.9＊2＊3.2
=（3.1+6.9）＊6.4
=10＊6.4
=64
望采纳！

Answer 2

3.1*6.4+13.8*3.2
=6.2*3.2+13.8*3.2
=3.2*(6.2+13.8)
=3.2*20
=64

Answer 3

原式变为:
3.2ⅹ(3.1ⅹ2+13.8)
=3.2ⅹ20
=64

Answer 4

3.1X2X3.2+13.8X3.2
=(3.1X2+13.8)X3.2
=(6.2+13.8)X3.2
=20X3.2
=64

Answer 5

3.1*2*3.2+13.8*3.2=(6.2+13.8)*3.2=20*3.2=64