问题 解答题

简便计算:

70.8-1.25-1.75

7.2×4.8+7.2×5.2

0.25×17.3×4

0.25×(4+0.4)

答案

(1)70.8-1.25-1.75

=70.8-(1.25+1.75)

=70.8-3

=67.8;

(2)7.2×4.8+7.2×5.2

=7.2×(4.8+5.2)

=7.2×10

=72;

(3)0.25×17.3×4

=0.25×4×17.3

=1×17.3

=17.3;

(4)0.25×(4+0.4)

=0.25×4+0.25×0.4

=1+0.1

=1.1.

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