Question

3.6乘2.6加7.4乘1.6等于多少简便运算？

Answer 1

3.6*2.6+7.4*1.6
=（2+1.6）*2.6+7.4*1.6
=2*2.6+1.6*2.6+7.4*1.6
=2*（2.5+0.1）+1.6*（2.6+7.4）
=2*2.5+2*0.2+1.6*10
=5+0.2+16
=21.2
请采纳谢谢

Answer 2

3.6×2.6＋7.4×1.6
=（2+1.6）×2.6＋7.4×1.6
=2×2.6+1.6×2.6＋7.4×1.6
=2×2.6+1.6×（2.6＋7.4）
=5.2+1.6×10
=5.2+16
=21.2
这道题主要考虑能够凑整的两个数，分解其中的一个，组成易于计算的数字。

Answer 3

3.6×2.6+7.4×1.6
=3.6×（1.6+1）+（6.4+1）×1.6
=3.6×1.6+3.6+6.4×1.6+1.6
=（3.6+6.4）×1.6+3.6+1.6
=10×1.6+3.6+1.6
=16+3.6+1.6
=21.2

Answer 4

3.6×2.6+7.4×1.6
=(1.6+2)×2.6+7.4×1.6
=1.6×2.6+2×2.6+7.4×1.6
=1.6×(2.6+7.4)+5.2
=1.6×10+5.2
=16+5.2
=21.2

Answer 5

应该是3.6×2.6+7.4×3.6吧
=3.6×(2.6+7.4)
=3.6×10
=36