问题
解答题
用简便算法计算,写出简算过程
|
答案
(1)7.8×103,
=7.8×(100+3),
=7.8×100+7.8×3,
=780+23.4,
=803.4;
(2)8.5×7.5+8.5×2.5,
=8.5×(7.5+2.5),
=8.5×10,
=85;
(3)1.25×0.63×8,
=(1.25×8)×0.63,
=10×0.63,
=6.3.
用简便算法计算,写出简算过程
|
(1)7.8×103,
=7.8×(100+3),
=7.8×100+7.8×3,
=780+23.4,
=803.4;
(2)8.5×7.5+8.5×2.5,
=8.5×(7.5+2.5),
=8.5×10,
=85;
(3)1.25×0.63×8,
=(1.25×8)×0.63,
=10×0.63,
=6.3.