题目内容
用简便方法计算.
6×9
|
(3.75+4.1+2.35)×9.8. |
分析:(1)化9
=9.2,再运用乘法分配律解答,
(2)先运用加法交换律求出括号里面算式得数,再运用乘法分配律解答.
1 |
5 |
(2)先运用加法交换律求出括号里面算式得数,再运用乘法分配律解答.
解答:解:(1)6×9
+9.2×4
+9
,
=(6+4
+1)×9.2,
=11.4×9.2,
=104.88;
(2)(3.75+4.1+2.35)×9.8,
=(6.1+4.1)×9.8,
=10.2×9.8,
=10×9.8+0.2×9.8,
=98+1.96,
=99.96.
1 |
5 |
2 |
5 |
1 |
5 |
=(6+4
2 |
5 |
=11.4×9.2,
=104.88;
(2)(3.75+4.1+2.35)×9.8,
=(6.1+4.1)×9.8,
=10.2×9.8,
=10×9.8+0.2×9.8,
=98+1.96,
=99.96.
点评:解答本题要注意分析算式中各数据关系,正确选择并运用简便算法.
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