题目内容
化简与计算
(1)12-(-18)-(+7)-15
(2)(
-
+
)×(-60)×24
(3)-14-
×[2-(-4)2]
(4)x-3(1+2x-x2)+2(3x-2-x2)
(1)12-(-18)-(+7)-15
(2)(
3 |
4 |
7 |
12 |
7 |
6 |
(3)-14-
1 |
7 |
(4)x-3(1+2x-x2)+2(3x-2-x2)
(1)原式=12+18-7-15
=30-22
=8;
(2)原式=
×24-
×24+
×24
=18-14+28
=32;
(3)原式=-1-
×(2-16)
=-1-
×(-14)
=-1+2
=1;
(4)原式=x-(3+6x-3x2)+(6x-4-2x2)
=x-3-6x+3x2+6x-4-2x2
=x2+x-7.
=30-22
=8;
(2)原式=
3 |
4 |
7 |
12 |
7 |
6 |
=18-14+28
=32;
(3)原式=-1-
1 |
7 |
=-1-
1 |
7 |
=-1+2
=1;
(4)原式=x-(3+6x-3x2)+(6x-4-2x2)
=x-3-6x+3x2+6x-4-2x2
=x2+x-7.
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