题目内容
计算:
(1)(-12)-5+(-14)-(-39)
(2)2-2÷
×3
(3)(
+
-
)×(-12)
(4)-14-(1-0.5)×
×[2-(-3)2].
(1)(-12)-5+(-14)-(-39)
(2)2-2÷
1 |
3 |
(3)(
5 |
12 |
2 |
3 |
3 |
4 |
(4)-14-(1-0.5)×
1 |
3 |
(1)(-12)-5+(-14)-(-39)
=-12-5-14+39
=8;
(2)2-2÷
×3
=2-6×3
=2-18
=-16;
(3)(
+
-
)×(-12)
=-5-8+9
=-4;
(4)-14-(1-0.5)×
×[2-(-3)2]
=-1-
×
×[2-9]
=-1-
×
×[-7]
=-1+
=
.
=-12-5-14+39
=8;
(2)2-2÷
1 |
3 |
=2-6×3
=2-18
=-16;
(3)(
5 |
12 |
2 |
3 |
3 |
4 |
=-5-8+9
=-4;
(4)-14-(1-0.5)×
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=-1+
7 |
6 |
=
1 |
6 |
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