问题 解答题
巧算.
12.5×3.5×0.8
3.6÷1.2÷37.2×7.2+3.8×7.2-7.2
答案

(1)12.5×3.5×0.8

=12.5×0.8×3.5

=10×3.5

=35;

(2)3.6÷1.2÷3

=3.6÷(1.2×3)

=3.6÷3.6

=1;

(3)7.2×7.2+3.8×7.2-7.2

=7.2×(7.2+3.8-1)

=7.2×10

=72.

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