题目内容

计算题:
(1)3
1
2
+(-
1
2
)-(-
1
3
)+2
2
3

(2)(
2
3
-
1
4
-
3
8
+
5
24
)×48

(3)-18÷(-3)2+5×(-
1
2
)2
-(-15)÷5
(4)[-38-(-1)7+(-3)8]×[-52].
(1)3
1
2
+(-
1
2
)-(-
1
3
)+2
2
3

=(3
1
2
-
1
2
)+(
1
3
+2
2
3

=3+3
=6;

(2)(
2
3
-
1
4
-
3
8
+
5
24
)×48

=32-12-18+10
=42-30
=12;

(3)-18÷(-3)2+5×(-
1
2
)2
-(-15)÷5
=-18÷9+5×
1
4
+3
=-2+1.25+3
=2.25;

(4)[-38-(-1)7+(-3)8]×[-52]
=[-38+38+1]×(-25)
=1×(-25)
=-25.
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