Question

3.2✘1.8+1.6✘16.3用简便方法怎么算？

Answer 1

先分解出公因数，再利用乘法规律：
原式=2x1.6x1.8+1.6x16.3
=1.6(3.6+16.3)=1.6x19.9=1.6x(20-0.1)
=32-0.16=31.84

Answer 2

简算：
3.2×1.8+1.6×16.3
=1.6×2×1.8+1.6×16.3
=1.6×3.6+1.6×16.3
=1.6×(3.6+16.3)
=1.6×19.9
=1.6×(20-0.1)
=1.6×20-1.6×0.1
=32-0.16
=31.84

Answer 3

这题乍一看没有公因数 观察后发现3.2是1.6的两倍
1.6*2*1.8+1.6*16.3
=1.6*（3.6+16.3）
=1.6*19.9
=1.6*（20-0.1）
=1.6*20-1.6*0.1
=32-0.16
=31.84

Answer 4

原式＝1.6×2×1.8＋1.6×16.3
＝1.6×（3.6＋16.3）
＝1.6×（20-0.1）
＝32-0.16＝31.84

Answer 5

=1.6×1.8×2+1.6×16.3
=1.6×(3.6+16.3+0.1)－1.6×0.1
=1.6×20－0.16
=32－0.16
=31.84