问题 解答题
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

(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.

问答题 简答题
问答题 简答题