7x+3y=44,11x+2y=61,求x,y
7x+3y=44,11x+2y=61,求x,y
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
若x+7y=y-3x,求x
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
3x-2y=15 3y-2x=11 求x+y
已知x-y=3,求代数式7-x+y-(y-x)^2的值.
已知4x²y-3y²=7,3x²y+4y²=19,求11x²y-2y&
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知x+y/y=11/8,求x-y/x+2y的值.