问题 解答题
巧算.
35.2×45.6+45.6×63.8+45.6;
(5.6×3.6×4)÷(1.8×2.8×2);
0.83×0.68+11.7×0.068;(12.8+12.8+12.8+12.8)×2.5.
答案

①35.2×45.6+45.6×63.8+45.6

=(35.2+63.8+1)×45.6

=100×45.6

=4560;

②(5.6×3.6×4)÷(1.8×2.8×2)

=(5.6÷2.8)×(3.6÷1.8)×(4÷2)

=2×2×2

=8;

③0.83×0.68+11.7×0.068

=0.83×0.68+1.17×0.68

=(0.83+0.17)×0.68

=1×0.68

=0.68;

④(12.8+12.8+12.8+12.8)×2.5

=12.8×4×2.5

=12.8×(4×2.5)

=12.8×10

=128.

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