题目内容
(2013?麻栗坡县模拟)用简便方法计算.
10.25+5.89+0.75+4.11
÷8+
×
.
10.25+5.89+0.75+4.11
| 15 |
| 17 |
| 2 |
| 17 |
| 1 |
| 8 |
分析:第一题用加法交换律与结合律简算,第二题用乘法分配律简算.
解答:解:10.25+5.89+0.75+4.11
=(10.25+0.75)+(5.89+4.11),
=11+10,
=22;
÷8+
×
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
=(10.25+0.75)+(5.89+4.11),
=11+10,
=22;
| 15 |
| 17 |
| 2 |
| 17 |
| 1 |
| 8 |
=
| 15 |
| 17 |
| 1 |
| 8 |
| 2 |
| 17 |
| 1 |
| 8 |
=(
| 15 |
| 17 |
| 2 |
| 17 |
| 1 |
| 8 |
=1×
| 1 |
| 8 |
=
| 1 |
| 8 |
点评:本题考查运算定律的运用,在牢记运算定律的基础上要灵活运用.
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