题目内容
计算:
(1)
a2-(-a2)+(-3a2);
(2)-4a-2(a-3b)+3(b-a);
(3)-
(3x-6)+
(6-3x);
(4)3(2x+1)-2[4x-(3x-1)].
(1)
5 |
2 |
(2)-4a-2(a-3b)+3(b-a);
(3)-
1 |
6 |
1 |
3 |
(4)3(2x+1)-2[4x-(3x-1)].
(1)原式=
a2+a2-3a2
=(
+1-3)a2
=
a2;
(2)原式=-4a-2a+6b+3b-3a
=-9a+9b;
(3)原式=-
x+1+2-x
=-
x+3;
(4)原式=3(2x+1)-2[4x-3x+1]
=6x+3-2(x+1)
=6x+3-2x-2
=4x+1.
5 |
2 |
=(
5 |
2 |
=
1 |
2 |
(2)原式=-4a-2a+6b+3b-3a
=-9a+9b;
(3)原式=-
1 |
2 |
=-
3 |
2 |
(4)原式=3(2x+1)-2[4x-3x+1]
=6x+3-2(x+1)
=6x+3-2x-2
=4x+1.
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