题目内容
计算:
(1)(-8)+(+0.25)-(-9)+(-
)
(2)-14÷(-
)+8×(-
)
(3)(
-
+
)÷(-
)
(4)-14-
×[2-(-3)2].
(1)(-8)+(+0.25)-(-9)+(-
1 |
4 |
(2)-14÷(-
3 |
2 |
3 |
2 |
(3)(
3 |
4 |
5 |
6 |
7 |
12 |
1 |
36 |
(4)-14-
1 |
6 |
(1)原式=-8+0.25+9-
=-8+9=1;
(2)原式=14×
-8×
=
-
=-9;
(3)原式=(
-
+
)×(-36)=-27+30-21=-18;
(4)原式=-1-
×(2-9)=-1+
=
.
1 |
4 |
(2)原式=14×
2 |
3 |
3 |
2 |
28 |
3 |
24 |
2 |
(3)原式=(
3 |
4 |
5 |
6 |
7 |
12 |
(4)原式=-1-
1 |
6 |
7 |
6 |
1 |
6 |
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