题目内容
计算题(1)36×(-
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
(2)(-2)2÷
| 1 |
| 8 |
(3)-(
| 2 |
| 3 |
| 3 |
| 5 |
| 5 |
| 3 |
(4)-
| 3 |
| 4 |
| 2 |
| 3 |
| 4 |
分析:在进行有理数的混合运算时需按以下几个步骤进行:1.细观察式子结构特点;2.合理确定运算顺序;3.灵活运用各级运算法则.第(1)题注意运用分配律;(2)题注意先算乘方,再算乘除,最后算加减.(3)题注意同级运算按从左到右顺序依次进行;(4)题注意先算括号里面的.
解答:解:(1)36(-
+
-
),
=36×(-
)+36×
+36×(-
),
=-18+12-66,
=-12;
(2)(-2)2÷
×8-|-4|,
=4÷
×8-4,
=4-4,
=0;
(3)-(
)2×3×4÷(-
)×
,
=-
×3×4÷(-
)×
,
=-
×4×
×
,
=-
;
(4)-
×[-32×(-
)2-
],
=-
×[-9×
-2],
=-
×(-6),
=
.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
=36×(-
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
=-18+12-66,
=-12;
(2)(-2)2÷
| 1 |
| 8 |
=4÷
| 1 |
| 8 |
=4-4,
=0;
(3)-(
| 2 |
| 3 |
| 3 |
| 5 |
| 5 |
| 3 |
=-
| 4 |
| 9 |
| 3 |
| 5 |
| 5 |
| 3 |
=-
| 4 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
=-
| 400 |
| 27 |
(4)-
| 3 |
| 4 |
| 2 |
| 3 |
| 4 |
=-
| 3 |
| 4 |
| 4 |
| 9 |
=-
| 3 |
| 4 |
=
| 9 |
| 2 |
点评:本题考查了有理数的混合运算,是初中生进行数学后续学习的重要基础知识.
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