问题 解答题

用递等式进行计算,能简便的要简便简便计算.

7.29×4.6+46×1.271

(28.7-18.6÷3.1)×0.8

16-5.32-4.68

40.8+14.7÷(14.6-12.5)

3.7×0.125+6.3÷8

0.72+9.6÷3.2.

答案

(1)7.29×4.6+46×1.271,

=7.29×4.6+4.6×12.71,

=(7.29+12.71)×4.6,

=20×4.6,

=92;

(2)(28.7-18.6÷3.1)×0.8,

=(28.7-6)×0.8,

=22.7×0.8,

=18.16;

(3)16-5.32-4.68,

=16-(5.32+4.68),

=16-10,

=6;

(4)40.8+14.7÷(14.6-12.5),

=40.8+14.7÷2.1,

=40.8+7,

=47.8;

(5)3.7×0.125+6.3÷8,

=3.7×0.125+6.3×

1
8

=(3.7+6.3)×0.125,

=1.25;

(6)0.72+9.6÷3.2,

=0.72+3,

=3.72.

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