12x^2+14xy-20y^2+20x-11y+3 过程谢谢
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已知x-xy=20,xy-y=12,则x-y= ,-2xy+x+y=
已知x-xy=20 xy-y=12,则x-y=( ),x+y-2xy=( ).
已知:x-xy=20,xy-y=12,则x-y=...,-2xy+x+y=...
x^2+xy+x=36,y^2+xy+y=20,求x+y.
12x^2+14xy-20y^2+20x-11y+3 过程谢谢
已知:x-xy=40,xy-y=-20,求代数式x-y和x+y-2xy的值.
x-xy=40,xy-y= -20,求代数式x-y和x+y-2xy算试
已知x-xy=20,xy-y=-10,则x-y=( ),x+y-2xy=( ).
已知x-xy=20,xy-y=-10,则x-y=?x+y-2xy=?
已知x-xy=20,xy-y=-10,则x-y=?,x+y-2xy?
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
1.分解因式:4x³-31x+152.把12x²+14xy-20y²+20x-11y+33.x³+6x²+11x+64.x⁴+2x³-9x²-2x+85.x²+xy-6y²+x+13y-66.x³+5x²+3x-9
15x^2-20xy-x+8y-2
5x^2-4y+xy-20x
(x^2+xy/x-y)/(xy/x-y)计算
x^3+x+30x^2-4xy+4y^2+7x-14y+12
已知1/x-1/y=3,则代数式2x-14xy-2y/x-2xy-y的值为__?各位知道的...已知1/x-1/y=3,则代数式2x-14xy-2y/x-2xy-y的值为__?各位知道的请支个招.感激不尽!2x-14xy-2y=-20xy?和x-2xy-y=-5xy?是怎样算出来的详细点喝,
分解因式2x^2+3xy-9x^2+14x-3y+20