1.(x^2-2y)(xy^2)^2= 2.(3x-2)(3-5x)的展开式中,二次项系数为(),一次项系数为3.8x^6-6x^6+12x^5+6x^4 4.(x+2)(y-3)-(x-1)(y+2) 5.(a-6)(a^2+b^2)(a+b) 6.(x+2y)^2(x-2y)^2 7.(a-2b+3c)(a-2b-3c)
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1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
已知x-xy=10,xy-y=2,则x-y=( ),-2xy+x+y=( ).
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
已知x-xy=20 xy-y=12,则x-y=( ),x+y-2xy=( ).
( )+x^2-xy+2y^2=2x^2+xy+3y^23x^2+xy-7y^2-( )=x^2-2xy+y^2
(xy-x²)÷(x²-2xy+y²/xy)×(x-y/x²)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
2xy+x+y=?(因式分解)
{x,xy,lg(xy)}={0,|x|,y} 则log8(X^2+Y^2)
求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
求(3x^+y^-5xy)-【2x^-(-4xy-y^+7x^)】=?
(X-3xy+4xy-y)-[-2x-2(xy-3/2xy)-y]+6xy的过程
计算:3xy[2xy-x(y-2)+x]
(-3x^y+2xy)-( )=4x^+xy
(XY-X^2)除以X-Y/XY=?
x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?
x^2-xy/xy-y^2约分
(xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以(xy)/(x-y)= -x(x-y)乘以(xy)/(x-y)= -x^2y这样做对吗?