2x²+5xy+2y²+3x+3y-9 6x²+13xy+6y²+5x+5y+1
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
无论x,y取何值时,代数式:(x³+3x²y-5xy+6y³)+(y³+2xy&
求3xy²-4x²y-2xy²+ 5x²y的值,其中x,y满足|x-1|+(y+
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
已知:x²-6xy+9y²=0,求代数式3x+5y/4x²-y²×(2x+y)的
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
先化简再求值:x的平方y-3x²-6xy+5xy+2x²y 其中x=11 y=-6