试题:
简便计算
12.5×(0.7×0.8)
6.25×1.021.25×99
12.5×32×2.54.12-1.78-1.224.2÷0.7÷6.

答案:

我来补答
(1)12.5×(0.7×0.8)
=12.5×0.8×0.7,
=10×0.7,
=7;

(2)6.25×1.02
=6.25×1+6.25×0.02,
=6.25+0.125,
=6.375;

(3)1.25×99
=1.25×100-1.25,
=125-1.25,
=123.75;

(4)12.5×32×2.5
=(12.5×8)×(2.5×4),
=100×10,
=1000;

(5)4.12-1.78-1.22
=4.12-(1.78+1.22),
=4.12-3,
=1.12;

(6)4.2÷0.7÷6
=4.2÷(0.7×6),
=4.2÷4.2,
=1.
 
 
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