题目内容
计算题
(1)(-8)+(+0.25)-(-9)+(-
);
(2)(-
)÷(
-
+
-
)
(3)-32-[-5+(1-0.6×
)÷(-3)2].
(4)先化简,再求值:2a+(-2a+5)-(-3a+2),其中a=-
.
(1)(-8)+(+0.25)-(-9)+(-
| 1 |
| 4 |
(2)(-
| 1 |
| 30 |
| 2 |
| 3 |
| 1 |
| 10 |
| 1 |
| 6 |
| 2 |
| 5 |
(3)-32-[-5+(1-0.6×
| 3 |
| 5 |
(4)先化简,再求值:2a+(-2a+5)-(-3a+2),其中a=-
| 1 |
| 3 |
(1)原式=-8+0.25+9-0.25
=1;
(2)原式=(-
)÷(
-
)
=-
÷
=-
;
(3)原式=-9-[-5+(1-
×
)÷9]
=-9-(-5+
×
)
=-9+5-
=-4
;
(4)2a+(-2a+5)-(-3a+2)
=2a-2a+5+3a-2
=3a+3,
当a=-
,原式=3a+3=3×(-
)+3=2.
=1;
(2)原式=(-
| 1 |
| 30 |
| 5 |
| 6 |
| 1 |
| 2 |
=-
| 1 |
| 30 |
| 1 |
| 3 |
| 1 |
| 10 |
(3)原式=-9-[-5+(1-
| 3 |
| 5 |
| 3 |
| 5 |
=-9-(-5+
| 16 |
| 25 |
| 1 |
| 9 |
=-9+5-
| 16 |
| 225 |
=-4
| 16 |
| 225 |
(4)2a+(-2a+5)-(-3a+2)
=2a-2a+5+3a-2
=3a+3,
当a=-
| 1 |
| 3 |
| 1 |
| 3 |
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