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用合理的方法计算486+8999000-271-729125×25×3286×33+86×66+867777×8+1111×4(120+780÷130)×84-10000.

题目详情
用合理的方法计算
486+899       9000-271-729       125×25×32
86×33+86×66+86             7777×8+1111×4 (120+780÷130)×84-10000.
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答案和解析
(1)486+899,
=500+900-14-1,
=1385;

(2)9000-271-729,
=9000-(271+729),
=9000-1000,
=8000;

(3)125×25×32,
=(125×8)×(25×4),
=1000×100,
=100000;

(4)86×33+86×66+86,
=86×(33+66+1),
=86×100,
=8600;

(5)7777×8+1111×4,
=1111×56+1111×4,
=1111×(56+4),
=1111×60,
=66660;

(6)(120+780÷130)×84-10000,
=(120+6)×84-10000,
=126×84-10000,
=10584-10000,
=584.