问题 解答题

简便计算

12.8-0.5×0.5-0.75

1.25×3.2×0.8

8.37×1.4+8.6×8.37.

答案

(1)12.8-0.5×0.5-0.75,

=12.8-0.25-0.75,

=12.8-(0.25+0.75),

=12.8-1,

=11.8;

(2)1.25×3.2×0.8,

=1.25×0.8×3.2,

=1×3.2,

=3.2;

(3)8.37×1.4+8.6×8.37,

=8.37×(1.4+8.6),

=8.37×10,

=83.7.

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