题目内容
计算:(1)-24+3-16-5;
(2)-23÷
| 4 |
| 9 |
| 2 |
| 3 |
(3)
| 3 |
| 4 |
| 1 |
| 3 |
| 14 |
| 15 |
(4) (
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
| 9 |
| 14 |
| 5 |
| 9 |
(5)-14-(1-0.5)×
| 1 |
| 3 |
分析:根据有理数的混合运算顺序和运算律分别求出结果,即可求出答案.
解答:解:(1)-24+3-16-5
=-21-16-5
=-42
(2)-23÷
×(-
)2
=-8×
×
=-8
(3)
×(8-1
-
)
=
×8-
×
-
×
=6-1-
=4
(4) (
+
)÷(-
)-
×(-1
)
=
×(-
)-
×(-
)
=-1-(-1)
=0
(5)-14-(1-0.5)×
×[2-(-3)2]
=-1-
×
×(2-9)
=-1-(-
)
=
=-21-16-5
=-42
(2)-23÷
| 4 |
| 9 |
| 2 |
| 3 |
=-8×
| 9 |
| 4 |
| 4 |
| 9 |
=-8
(3)
| 3 |
| 4 |
| 1 |
| 3 |
| 14 |
| 15 |
=
| 3 |
| 4 |
| 3 |
| 4 |
| 4 |
| 3 |
| 3 |
| 4 |
| 14 |
| 15 |
=6-1-
| 7 |
| 10 |
=4
| 3 |
| 10 |
(4) (
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
| 9 |
| 14 |
| 5 |
| 9 |
=
| 5 |
| 6 |
| 6 |
| 5 |
| 9 |
| 14 |
| 14 |
| 9 |
=-1-(-1)
=0
(5)-14-(1-0.5)×
| 1 |
| 3 |
=-1-
| 1 |
| 2 |
| 1 |
| 3 |
=-1-(-
| 7 |
| 6 |
=
| 1 |
| 6 |
点评:本题主要考查了有理数的混合运算,在解题时要注意运算顺序和运算律的综合应用.
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