(很有难度、拜托啊):1)3x²+5xy-2y²+x+9y-4 2) 2x²+
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(很有难度、拜托啊):1)3x²+5xy-2y²+x+9y-4 2) 2x²+
1)3x²+5xy-2y²+x+9y-4
2) 2x²+xy-y²-4x+5
额、对不起啊。第二题打错了:
2)2x²+xy-y²-4x+5y-6
....我跪倒。
1)3x²+5xy-2y²+x+9y-4
2) 2x²+xy-y²-4x+5
额、对不起啊。第二题打错了:
2)2x²+xy-y²-4x+5y-6
....我跪倒。
3x²+5xy-2y²+x+9y-4
=3x²+5xy-2y²+4x-3x+8y+y-4
=(x+2y)(3x-y)+4x+8y-3x+y-4
=(x+2y)(3x-y)+4(x+2y)-(3x-y+4)
=(x+2y)(3x-y+4)-(3x-y+4)
=(x+2y-1)(3x-y+4)
2x²+xy-y²-4x+5y-6
=(2x-y)(x+y)+2x-6x+2y+3y-6
=(2x-y)(x+y)+2(x+y)-3(2x-y)-6
=(2x-y)(x+y-3)+2(x+y-3)
=(2x-y+2)(x+y-3)
=3x²+5xy-2y²+4x-3x+8y+y-4
=(x+2y)(3x-y)+4x+8y-3x+y-4
=(x+2y)(3x-y)+4(x+2y)-(3x-y+4)
=(x+2y)(3x-y+4)-(3x-y+4)
=(x+2y-1)(3x-y+4)
2x²+xy-y²-4x+5y-6
=(2x-y)(x+y)+2x-6x+2y+3y-6
=(2x-y)(x+y)+2(x+y)-3(2x-y)-6
=(2x-y)(x+y-3)+2(x+y-3)
=(2x-y+2)(x+y-3)
(3x+2y)(9x²-6xy+4y²﹚
3y/2x+2y+2xy/x²+xy 2x/x²-64y²-1/x-8y (1/a+1/b
已知 (x+1)² +|y-1|=0,求 2(xy-xy²)-(3xy²-xy) 的值.
化简(x²-2xy+y²-1)/x-y-1=? 写上过程! 谢!
分解因式:x²-3xy+2y²+x-2
已知,x²-2y²-2xy-4y+4=0 求x²+y²的值
x²-3xy-10y²+x+9y-2如何分解因式
计算:(1).(-2xy²)*(3x²y)²
(3x-2y)²(3x-2y)²(9x²+4y²)²
越快越好(1)(xy²+3)(xy²+3)-2x(-x+y)(2)(x+2)(x²+4)(
①先化简,再求值.4(3x²y—1/2xy²)—5(—xy²+3x²y),其中x
x²-3xy-10y²+X+9Y-2因式分解