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能简便计算的尽量用简便方法计算37×49+37×51108×2525×125×2×456×99+56124×75-124×72-124×2104×39-39×4.

题目详情
能简便计算的尽量用简便方法计算
37×49+37×51 108×25 25×125×2×4
56×99+56 124×75-124×72-124×2 104×39-39×4.
▼优质解答
答案和解析
(1)37×49+37×51,
=37×(49+51),
=37×100,
=3700;

(2)108×25,
=27×4×25,
=27×(4×25),
=27×100,
=2700;

(3)25×125×2×4,
=(25×4)×(125×2),
=100×250,
=25000;

(4)56×99+56,
=56×(99+1),
=56×100,
=5600;

(5)124×75-124×72-124×2,
=124×(75-72-2),
=124×1,
=124;

(6)104×39-39×4,
=(104-4)×39,
=100×39,
=3900.