计算:(1)-|-1834|+(+4312)-|-(-1313)|+|-7012|;(2)(-2×5)3-(-179)×(-34)2-(-10.1)2;(3)2...

2023-07-11 07:11发布

这道初中数学的题目是:
计算:
(1)-|-18
3
4
|+(+43
1
2
)-|-(-13
1
3
)|+|-70
1
2
|

(2)(-2×5)3-(-1
7
9
)×(-
3
4
)2-(-
1
0.1
)2

(3)
2
3
+(
5
6
+2.8+
1
3
)-(2
4
5
-
5
6
)

(4)-14-(1-0.5)×(
2
3
)2÷[-2-(-3)2]
1条回答
shanzha
2023-07-11 07:22
这道初中数学题的正确答案为:
(1)原式=-18
3
4
+43
1
2
-13
1
3
+70
1
2

=(43
1
2
+70
1
2
)-(18
3
4
+13
1
3

=114-(18+13)-(
3
4
+
1
3

=114-31-
13
12

=83-
13
12

=81
11
12


(2)原式=(-10)3-(-
16
9
)×
9
16
-(-10)2
=(-10)2(-10-1)+1
=-1100+1
=-1009;

(3)原式=
2
3
+
5
6
+2.8+
1
3
-
14
5
+
5
6

=(
2
3
+
1
3
)+(
5
6
+
5
6
)+2.8-
14
5

=1+
5
3
+
14
5
-
14
5

=
8
3


(4)原式=-1-
1
2
×
4
9
÷[-2-9]
=-1-
2
9
×(-
1
11

=-1+
2
99

=-
97
99
解题思路 34

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