(2)x^2+x-2
(3)x^2-3x+2
(4)x^2-x-2
2.( 1)2x^2-3xy-2y^2
(2)2a^3+8ab^2+a^2b^2+4b^4
3. 16b^2+ 16b-48ab-48a
4.m=3
n=-28
5.B
6.D
7.D
8.D
9.B
10.( 1)2a^2+ab-b^2
(2)-0.2a-a^2-0.2-a
(3)4x^2- 12xy+9y^2
(4)- 10x+6
1 1.-2 1
12.B
13.D
14.- 13
15.( 1)x^2+3x+2
x^2+2x-3
⑵(a+b)
(ab)
(3)x^2+(2+m)x+2m
16.m=6
2x^2-3m
17.-3/4
18.a=-2
b=-4
19. 13.5cm^2
20.( 1)3.5
(2) 1/6
(3)2.5x=8.5y+3
2 1.C
22.C
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