题目内容
计算题:
(1)3
+(-
)-(-
)+2
(2)(
-
-
+
)×48
(3)-18÷(-3)2+5×(-
)2-(-15)÷5
(4)[-38-(-1)7+(-3)8]×[-52].
(1)3
1 |
2 |
1 |
2 |
1 |
3 |
2 |
3 |
(2)(
2 |
3 |
1 |
4 |
3 |
8 |
5 |
24 |
(3)-18÷(-3)2+5×(-
1 |
2 |
(4)[-38-(-1)7+(-3)8]×[-52].
(1)3
+(-
)-(-
)+2
=(3
-
)+(
+2
)
=3+3
=6;
(2)(
-
-
+
)×48
=32-12-18+10
=42-30
=12;
(3)-18÷(-3)2+5×(-
)2-(-15)÷5
=-18÷9+5×
+3
=-2+1.25+3
=2.25;
(4)[-38-(-1)7+(-3)8]×[-52]
=[-38+38+1]×(-25)
=1×(-25)
=-25.
1 |
2 |
1 |
2 |
1 |
3 |
2 |
3 |
=(3
1 |
2 |
1 |
2 |
1 |
3 |
2 |
3 |
=3+3
=6;
(2)(
2 |
3 |
1 |
4 |
3 |
8 |
5 |
24 |
=32-12-18+10
=42-30
=12;
(3)-18÷(-3)2+5×(-
1 |
2 |
=-18÷9+5×
1 |
4 |
=-2+1.25+3
=2.25;
(4)[-38-(-1)7+(-3)8]×[-52]
=[-38+38+1]×(-25)
=1×(-25)
=-25.
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