问题
解答题
你能用简便方法计算吗?
4.8×25
1.25×3.2
101×8.8
15.6×8.6+4.4×8.6
4×1.25×2.5×0.8.
答案
(1)4.8×25
=1.2×(4×25)
=1.2×100
=120;
(2)1.25×3.2
=1.25×8×0.4
=10×0.4
=4
(3)101×8.8
=(100+1)×8.8
=100×8.8+8.8
=880+8.8
=888.8;
(4)15.6×8.6+4.4×8.6
=(15.6+4.4)×8.6
=20×8.6
=172
(5)4×1.25×2.5×0.8
=4×2.5×(1.25×0.8)
=10×1
=10.