6x^2+17x-3x^2-11xy-12y^2

计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2 因式分解3x^2-6xy+x (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) (1)已知x+y=6,xy=-3,x^2y+xy^2=(2)x*[2-(1/x)]+(x/x^2-2x)*(x^2-4) -3(2x^2-xy)+4(x^2+xy-6) 几道数学题：x-x^2分之x^2-1×1-y分之xy-x,（xy-x^2）÷xy分之x-y,x^2+x分之x-3÷（x^2-6x+9）谢谢! -3(2x-xy)-4(-6+xy+x.其中x=1,y=-1 1-(3xy-x)+【-2(2x+3xy)】 4(x²+xy-6)-3(2x²-xy) -3(2x²-xy)+4(x²+xy-6) 计算3xy[2xy-x(y-2)+x-1] 计算：（1）（7-3x)+(5x-6) (2)-(x^2-3)-(7-5x^2) (3)xy-(3x-2xy)+(3xy-2x) 先化简,再求值：-4x+7x-5-3x-6x+2,其中x=-2分之1 4xy-3x-xy先化简,再求值：-4x+7x-5-3x-6x+2,其中x=-2分之14xy-3x-xy+y+x-3xy-2y+2x+x,其中x=-5,y=-1 3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程 3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x) (5x^2+6x-7)+[-4x^2-( )] =x^2+2x+1 （x^3-4x^2y+11xy^2-y^3）+（）=x^3+3x^2y-5xy^2 6x^2+17x-3x^2-11xy-12y^2