中二數學一問(5)

1a.2(a+b)
1b.3(x-y)
1c.a(x+y)
2a.3(2a-5b)
2b.6(2x+3y)
2c.-a(x-y)
3a.2a(x+y)
3b.5x(y-z)
3c.ab(x+y)
4a.3a(2-5b)
4b.6y(3x+2)
4c.ax2次x-a2次x <<<不太明白問題
5a.-5(a+3b)
5b -6x(3 + x)
5c. -ax(a + x)
6a.7(a-b-c)
6b.a(x+y-z)
6c.3x(9x^2 - 3xy + y^2)
7a.3(a+4)
7b.5(b-3)
7c.2(xy+4).
8a.2(8-9a)
8b.15(x-2)
8c.5(3-5y)
9a.3(a+1)
9b.5(b-1)
9c.2(xy+1)
10a.6(1-3a)
10b.3(5x-1)
10c.-5(1+5y)
11a.3a(b+1)
11b.5y(x-1)
11c.2b(a+1)
12a.6a(1-3a)
12b.3x(5x-1)
12c.-5xy(1+5z)

??????

你係咪想因式分解呀朋友,你講我咪做囉,
你唔講點做呀!~

2007-12-08 11:37:42 補充：
1a.2a 2b=2(a b)1b.3x-3y=3(x-y)1c.ax ay=a(x y)2a.6a-15b=3(2a-3b)2b.12x 18y=6(2x 3y)2c.-ax ay=a(-x y)或者-a(x-y)3a.2ax 2ay=2a(x y)3b.5xy-5xz=5x(y-z)3c.abx aby=ab(x y)4a.6a-15ab=3a(2-5b)4b.18xy 12y=6y(3x 2)4c.ax2次x-a2次x=5a.-5ab-15b=-5b(a 3)或者5b(-a-3)