有分.(1)x^3+2y-x-2x^2y.(2)x^3-2x+1.(3)x^3+3x^2+3x+2.(4)x^4-7x^2+9.(5)x^2+4xy-4y^2.(用求根法.)

[2x(y-1)^5-3x^2(y-1)^4-6x^3(1-y)^3]/[-2X(y-1)^3]有过程再加分 x(x-y)2-(y-x)3 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x matlab画几个二元函数x*y/(x^2+y^2)^0.51/(x+y)x*y/(x+y)1/(x*y)sin(x+y)sin(x*y)sin(x)+sin(y)这么多,回答了再加分怎么设置上下限? 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若有以下程序段：int x=1,y=2; x=x^y; y=y^x;x=x^y; 则执行以上语句后x和y的值分别是 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 有这样一道题：“计算2x*x*x-3x*x*y-2xy*y-x*x*x+2xy*y-y*y*y-x*x*x+3x*x*y-y*y*y的值x=1/2,y=-1 (3x-y)^2+(3x+y)(3x-y),x=1,y=-2 二元一次方程 ：2(x+y)-(x-y)=3 (x+y)-2(x-y)=1