简便运算 ①6.2×10.1 ②1.25×32×0.25 ③35.4×44.2-35.3×44.3.

问题描述:

简便运算
①6.2×10.1
②1.25×32×0.25
③35.4×44.2-35.3×44.3.

①6.2×10.1,
=6.2×(10+0.1),
=62+0.62,
=62.62;
②1.25×32×0.25,
=1.25×8×4×0.25,
=(1.25×8)×(4×0.25),
=10×1,
=10;
③35.4×44.2-35.3×44.3,
=(35.4-35.3)×44.3,
=0.1×44.3,
=4.43.