问题 解答题
用你喜欢的方法计算.
2.5×0.32×12.5
0.4×0.2÷0.4×0.2
2.7+1.56+7.3+13.44 3.8×4.5+3.8
301×99 14×[752-(152+28)].
答案

(1)2.5×0.32×12.5

=(2.5×0.4)×(0.8×12.5)

=1×10

=10;

(2)0.4×0.2÷0.4×0.2

=0.4÷0.4×0.2×0.2

=0.04;

(3)2.7+1.56+7.3+13.44

=(2.7+7.3)+(1.56+13.44)

=10+15

=25;

(4)3.8×4.5+3.8

=3.8×(4.5+1)

=3.8×5.5

=20.9;

(5)301×99

=(300+1)×99

=300×99+99

=29700+99

=29799;

(6)14×[752-(152+28)]

=14×[752-180]

=14×572

=8008.

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