用简便方法计算 45+208+155 23+(159+77) 307+256 6×(19×5) 24×25
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发布时间:2024-10-01 23:12
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时间:2024-10-26 12:43
(1)45+208+155,
=45+155+208,
=100+208,
=308;
(2)23+(159+77),
=23+77+159,
=100+159,
=259;
(3)307+256,
=300+(7+256),
=300+263,
=563;
(4)6×(19×5),
=6×5×19,
=30×19,
=570;
(5)24×25,
=(4×25)×6,
=100×6,
=600;
(6)25×32×125,
=(25×4)×(8×125),
=100×1000,
=100000.