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脱式计算.(能简算的用简算)

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/19 14:47:54
脱式计算.(能简算的用简算)
(1)25×4.4     (2)7.7×0.16÷7.7×12.5   (3)10.64÷(3.7-2.9)
(4)4.8×99+4.8   (5)47.3+21×(3.9-0.87)(6)5×[(68.41-32.17)÷0.4].
(1)25×4.4,
=25×4+25×0.4,
=100+10,
=110;
(2)7.7×0.16÷7.7×12.5,
=7.7÷7.7×0.8×0.2×12.5,
=1×0.2×12.5×0.8,
=0.2×10,
=2;
(3)10.64÷(3.7-2.9),
=10.64÷0.8,
=13.3;
(4)4.8×99+4.8,
=4.8×(99+1),
=4.8×100,
=480;
(5)47.3+21×(3.9-0.87),
=47.3+21×3.03,
=47.3+63.63,
=110.93;
(6)5×[(68.41-32.17)÷0.4],
=5×(36.24÷0.4)
=5×90.6,
=453.