0.125+5/12+7/12用简便方法计算下面各题

发布网友 发布时间:2024-10-24 02:45

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热心网友 时间:2024-11-07 23:15

(1)0.125×5.46×8,
=(0.125×8)×5.46,
=1×5.46,
=5.46;

(2)2.5×3.2×125,
=(2.5×4)×(0.8×125),
=10×100,
=1000;

(3)4.9×101,
=4.9×100+4.9×1,
=490+4.9,
=494.9;

(4)4.5×12.6-3.6×4.5+4.5,
=4.5×(12.6-3.6+1),
=4.5×10,
=45;

(5)5.74×99+5.74,
=5.74×(99+1),
=5.74×100,
=574;

(6)19.7×lOl一19.7.
=19.7×(101-1),
=19.7×100,
=1970.

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