（3x-2y+3xy）-（x-4y-2xy）,其中x+y=3 xy=-2 化简求值

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? 求（3x^+y^-5xy）-【2x^-（-4xy-y^+7x^）】=? 因式分解 （3x+2y）-（x-y）² x²-xy+3y-3x 2x²+xy-y²-4x+5y-6 X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系（要求一步一步写出来） x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 化简2(x²y+xy)-3(x²y-xy)-4x²y （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 约分：（1）-4x^2y^3/10xy^4(2)（x^2-4xy+4y^2)(y-x)/(2y-x)(x^2-y^2) (1)ac分之2bc (2)xy²分之（x+y）y (3)(x+y)^2/x^2+xy (4)(x-y)^2/x^2-y^2 若|x-3|+（y+2）=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 若|x-3|+（y+2）²=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 已知（x+2）^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy