2x+y=4 x+2y=5 x+y等于?
x/4+2等于x,x=多少.y/5等于y-3,Y=多少
y*y*y*y+2x*x*x*x=4x*x*y 求x等于几,y等于几,写出所有选项!
2x+y=4 x+2y=5 x+y等于?
4x+5y=105,2x+3y=178,x,y等于
x:2=y:4,则x:y等于
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
9x+8y=-2,4x+5y=-11,y最后等于多少
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
实数X,Y满足X大于等于Y大于等于1和2X平方-xy-5x+y+4=o,则x+y的值