y=5x/（x^2-3x+2）+arcsin1/x的定义域答案是（-∞,-1】,（1,2）,（2,

先化简,再求值 [2/3x - 2/x+y（x+y/3x -x-y）]*x/x-y,其中5x+3y=0 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若x-y分之x+y=3,求式子x+y分之5(x-y)—2（x-y）分之x+y的值 化简 求值 x-{-5x-[-y+（-x+3y）+x]},其中x=-1,y=-2； x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 （x-y）^3×（y-x）^4+（x-y）^2×（y-x）^5 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 3^x+2x=y,x 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 先化简,再求值:[3x-2/x+y(x+y/3x-x-y)]/(x-y/x),其中5x+3y=0 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 2(x-y)+3（x+y）2-5(x-y)-8（x+y）2-（x-y）