(1)2x²-7x+3= (2)6x²-7x-5 (3)5x²+6xy-8y²
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
合并同类项(1)2x-3x-7x(2)2xy-3xy+5xy(3)5x^3y-6x-7x^3y-8x(4)2/3x^2-
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
(-3xy)(5x²y)+6x平方(2/7xy²-2y²)
2x²-7x+3 、 6x²-7x-5、5x²+6xy-8y²、2X²
已知(x+2)²+│y-1│=0,求7x²y-3+2xy²-6x²y-2xy
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,
分解因式8(x²-2y²)-x(7x+y)+xy=