题目内容
用简便方法计算
4×9.6×2.5
5.4×102
9.7×0.47+0.53×9.7.
4×9.6×2.5
5.4×102
9.7×0.47+0.53×9.7.
分析:(1)运用乘法交换律简算;
(2)把102看作100+2,运用乘法分配律简算;
(3)运用乘法分配律简算.
(2)把102看作100+2,运用乘法分配律简算;
(3)运用乘法分配律简算.
解答:解:(1)4×9.6×2.5,
=(4×2.5)×9.6,
=10×9.6,
=96;
(2)5.4×102,
=5.4×(100+2),
=5.4×100+5.4×2,
=540+10.8,
=550.8;
(3)9.7×0.47+0.53×9.7,
=9.7×(0.47+0.53),
=9.7×1,
=9.7.
=(4×2.5)×9.6,
=10×9.6,
=96;
(2)5.4×102,
=5.4×(100+2),
=5.4×100+5.4×2,
=540+10.8,
=550.8;
(3)9.7×0.47+0.53×9.7,
=9.7×(0.47+0.53),
=9.7×1,
=9.7.
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.
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