x十y=240 x=y+y+y x=多少 y=多少

x十y=240 x=y+y+y x=多少 y=多少 x十x十x十y十y=54?x十x十y十y=46?x,y各等于多少? x十y+2x十2y一1x十7y= x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = X+x+x+y+y=95 x+x+y+y+y=105 x,y分别为多少 x十y=10,2X十y=12,求x、y x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 (x*x+y*y)(x*x+y*y)-(x*x+y*y)=12 求x*x+y*y等于多少 X十y=48、y=X十X十X、X=（）y=（） x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? x分之a十x分之b=?x-y分之x^2十y-x分之y^=? -y+x²y=多少? 现规定一种新运算：x*y=(x+y)-(x-y),其中x,y为有理数,则x*y+(x+y)*(x-y)等于多少 y=x(x 己知x十y=5,xy=6,求x(x十y)(x一y)一x(x十y)的平方的值. x+x+x+x+y+y+y=56