题目内容

计算:
|-7|+|4|=
4
5
÷
8
15
=
(-0.5)÷(-
1
4
)
=
-
3
4
+
1
2
=
|-(-2)|-(-|-
1
2
|)
=
-
7
5
+
1
10
=
10.01×8.99≈
4
25
4
25
2
5
=
2
5
25÷|-
1
2
|
=
-|-2|×|-
1
5
|
=
分析:|-7|+|4|=7+4,|-(-2)|-(-|-
1
2
|)
=2+
1
2
,25÷|-
1
2
|
=25÷
1
2
-|-2|×|-
1
5
|
=-2×
1
5
由此求解;
(-0.5)÷(-
1
4
)
根据负数除以负数等于正数求解;
(  ):
2
5
=
2
5
根据比与除法的关系求解.
解答:解:
|-7|+|4|=11,
4
5
÷
8
15
=
3
2
(-0.5)÷(-
1
4
)
=2,
-
3
4
+
1
2
=-
1
4
|-(-2)|-(-|-
1
2
|)
=2
1
2
-
7
5
+
1
10
=-
13
10
10.01×8.99≈90,
4
25
2
5
=
2
5
25÷|-
1
2
|
=50,
-|-2|×|-
1
5
|
=-
2
5
故答案为:11,
3
2
,2,
1
4
,2
1
2
,-
13
10
,90,
4
25
,50,-
2
5
点评:解决本题关键是理解绝对值的含义,弄清楚是正数还是负数,进而求解.
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