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下面各题,怎样算简便就怎样算 102×4.5 0.25×4.8 4.25×3.7-0.37×32.5 5.23×4+4.

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/21 16:03:58
下面各题,怎样算简便就怎样算
102×4.5 0.25×4.8 4.25×3.7-0.37×32.5
5.23×4+4.77÷0.25 6.67-(4.54-3.33) 28.6×101-28.6.
(1)102×4.5
=(100+2)×4.5,
=100×4.5+2×4.5,
=450+9,
=459;
(2)0.25×4.8
=0.25×4×1.2,
=1×1.2,
=1.2;
(3)4.25×3.7-0.37×32.5
=42.5×0.37-0.37×32.5,
=(42.5-32.5)×0.37,
=10×0.37,
=3.7;
(4)5.23×4+4.77÷0.25
=5.23×4+4.77÷
1
4,
=5.23×4+4.77×4,
=(5.23+4.77)×4,
=10×4,
=40;
(5)6.67-(4.54-3.33)
=6.67+3.33-4.54,
=10-4.54,
=5.46;
(4)28.6×101-28.6
=28.6×(100+1)-28.6,
=28.6×100+28.6×1-28.6,
=2860+(28.6-28.6),
=2860+0,
=2860.