题目内容
2÷（80%×11
-1.25×
）×（7
+
+0.625）
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| 8 |
分析：先算括号里的把80%看做
，11
看做11.25，利用乘法分配律计算，后面括号里的计算看做7.25+0.125+0.625利用加法的结合律先做0.125+0.625再和7.25相加，最后算括号外面的除和乘．
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| 5 |
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解答：解：2÷（80%×11
-1.25×
）×（7
+
+0.625），
=2÷[
×（11.25-1.25）]×[7.25+（0.125+0.625）]，
=2÷[
×10]×[7.25+0.75]，
=2÷8×8，
=2．
| 1 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
| 1 |
| 8 |
=2÷[
| 4 |
| 5 |
=2÷[
| 4 |
| 5 |
=2÷8×8，
=2．
点评：考查了运算定律与简便运算，四则混合运算．注意运算顺序和运算法则，灵活运用所学的运算律简便计算．
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