题目内容

脱式计算、(能简算的简算)
201×0.65-0.65 3.6×0.7×2.5
6.44×3.7+6.44×6.3 1.25×39.5×0.8.
分析:(1)(3)运用乘法分配律简算;
(2)把3.6看作4×0.9,运用乘法交换律与结合律简算;
(4)运用乘法交换律与结合律简算.
解答:解:(1)201×0.65-0.65,
=(201-1)×0.65,
=200×0.65,
=130;

(2)3.6×0.7×2.5,
=4×0.9×0.7×2.5,
=(0.9×0.7)×(2.5×4),
=0.63×10,
=6.3;

(3)6.44×3.7+6.44×6.3,
=6.44×(3.7+6.3),
=6.44×10,
=64.4;

(4)1.25×39.5×0.8,
=(1.25×0.8)×39.5,
=1×39.5,
=39.5.
点评:完成本题,要注意分析式中数据,运用合适的简便方法计算.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网