问题 解答题
递等式计算(能简便的简便)
125×3.2×2.53.6×10.15.8×2.7+0.58×73
3.6+6.4×1.8(1.48+3.02)÷(3.6×0.5)(36.7-4.9)×101-31.8.
答案

①125×3.2×2.5,

=125×8×0.4×2.5,

=(125×8)×(0.4×2.5),

=1000×1,

=1000;

②3.6×10.1,

=3.6×(10+0.1),

=3.6×10+3.6×0.1,

=36+0.36,

=36.36;

③5.8×2.7+0.58×73,

=5.8×2.7+5.8×7.3,

=5.8×(2.7+7.3),

=5.8×10,

=58;

④3.6+6.4×1.8,

=3.6+11.52,

=15.12;

⑤(1.48+3.02)÷(3.6×0.5),

=4.5÷1.8,

=2.5;

⑥(36.7-4.9)×101-31.8,

=31.8×101-31.8,

=31.8×(101-1),

=31.8×100,

=3180.

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