问题
解答题
用简便方法计算.
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答案
(1)25×29×4,
=(25×4)×29,
=100×29,
=2900;
(2)720-238-162,
=720-(238+162),
=720-400,
=320;
(3)612+(465+388),
=612+465+388,
=(612+388)+465,
=1000+465,
=1465;
(4)6000÷125÷8,
=6000÷(125×8),
=6000÷1000,
=6;
(5)169×28+131×28,
=(169+131)×28,
=300×28,
=8400;
(6)48×125,
=6×8×125,
=6×(8×125),
=6×1000,
=6000.