求解初中数学题（x-y)-2(y-x) 2(x-y)-8(y-x) x(a-3)-(3-a) (x2-y2)-3(x+y)求解因式分解法.八年级数学.谢
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求解初中数学题（x-y)-2(y-x) 2(x-y)-8(y-x) x(a-3)-(3-a) (x2-y2)-3(x+y)求解因式分解法.八年级数学.谢
求解初中数学题（x-y)-2(y-x) 2(x-y)-8(y-x) x(a-3)-(3-a) (x2-y2)-3(x+y)求解因式分解法.八年级数学.谢
求解初中数学题（x-y)-2(y-x) 2(x-y)-8(y-x) x(a-3)-(3-a) (x2-y2)-3(x+y)求解因式分解法.八年级数学.谢
（x-y)-2(y-x)
=(x-y)+2(x-y)
=3(x-y)
=3x-3y
2(x-y)-8(y-x)
=2(x-y)+8(x-y)
=10(x-y)
=10x-10y
x(a-3)-(3-a)
=x(a-3)+(a-3)
=(a-3)(x+1)
(x2-y2)-3(x+y)
=(x+y)(x-y)-3(x+y)
=(x+y)(x-y-3)
1.
（x-y)-2(y-x)
=(x-y)+2(x-y)
=3(x-y)
2.
2(x-y)-8(y-x)
=2(x-y)+8(x-y)
=10(x-y)
3.
x(a-3)-(3-a)
=x(a-3)+(a-3)
=(a-3)(x+1)
4.
(x2-y2)-3(x+y)
=(x+y)(x-y)-3(x+y)
=(x+y)(x-y-3)
检查一下题
（x-y)-2(y-x) 2(x-y)-8(y-x) x(a-3)-(3-a) (x2-y2)-3(x+y)
=(x-y)+4(x-y)²+8x(x-y)(a-3)+2(a-3)(x-y)-3(x+y)
=(x-y) [1-4(x-y)] + (a-3) (x-y) (8x+2) -3(x+y)
=(x-y)[1-4(x-y)+(a-3)(8x+2)]-3(x+y)
应该就是这样了，哈哈
1.
=(x-y)+2(x-y)
=3(x-y)
=3x-3y
2.
=2(x-y)+8(x-y)
=10(x-y)
=10x-10y
3.
=x(a-3)+(a-3)
=(a-3)(x+1)
4.
=(x+y)(x-y)-3(x+y)
=(x+y)(x-y-3)