题目内容
计算:
(1)3
-(-
)+(-
)+2
(2)-14-
×〔3-(-32)〕×(-2)
(3)(-
-
+
)×(-6)2
(4)-22-[2-(1+
×0.5)]÷[32-(-2)2].
(1)3
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
(2)-14-
| 1 |
| 6 |
(3)(-
| 7 |
| 9 |
| 11 |
| 12 |
| 1 |
| 6 |
(4)-22-[2-(1+
| 1 |
| 3 |
分析:(1)先化简,再按同分母分数归类计算即可;
(2)先算乘方,再算括号,再算乘法,最后算减法;
(3)先算乘方,再按乘法分配律简算;
(4)先算乘方,再算乘法,再算括号内的加减,再算除法,最后算括号外面的减法.
(2)先算乘方,再算括号,再算乘法,最后算减法;
(3)先算乘方,再按乘法分配律简算;
(4)先算乘方,再算乘法,再算括号内的加减,再算除法,最后算括号外面的减法.
解答:解:(1)原式=3
+
-
+2
=3
-
+
+2
=3+3
=6;
(2)原式=-1-
×(3-9)×(-2)
=-1-
×(-6)×(-2)
=-1-2
=-3;
(3)原式=(-
-
+
)×36
=-
×36-
×36+
×36
=-28-33+6
=-61+6
=-55;
(4)原式=-4-[2-(1+
)]÷[9-4]
=-4-[2-1
]÷5
=-4-
×
=-4-
=-4
.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
=3
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
=3+3
=6;
(2)原式=-1-
| 1 |
| 6 |
=-1-
| 1 |
| 6 |
=-1-2
=-3;
(3)原式=(-
| 7 |
| 9 |
| 11 |
| 12 |
| 1 |
| 6 |
=-
| 7 |
| 9 |
| 11 |
| 12 |
| 1 |
| 6 |
=-28-33+6
=-61+6
=-55;
(4)原式=-4-[2-(1+
| 1 |
| 6 |
=-4-[2-1
| 1 |
| 6 |
=-4-
| 5 |
| 6 |
| 1 |
| 5 |
=-4-
| 1 |
| 6 |
=-4
| 1 |
| 6 |
点评:此题考查有理数的混合运算,注意混合运算的顺序,抓住数字特点,灵活运用运算定律简算.
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