求满足5x+3y=x+2y=7的x,y的值

若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 已知：x,y满足|2x-y|+|y-1/2|=0,求7x-3y的值. 如果x,y表示有理数,且x、y满足条件,|x|=5,|y|=2.|x-y|=y-x,求：x+2y的值. 已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+ 已知X、Y满足2X-7Y=3M,X+2Y=4m+5,且X+Y=0,求M的值 已知x,y满足2x-7y=3m,x+2y=4m+5,且x+y=o,求m的值 若实数x,y满足 x+y=3,x^2+y^2=7,求x^5+y^5的值 已知x y满足等式2分之3x+y=14分之5x-y=1,求2x-3y+7的值 如果x,y满足2x-5y=0,且y≠0,求2x-y/5x-7y的值 如果x,y满足2x-5y=0,且y不等于0,求2x-y/5x+7y的值? 若x、y、z满足2x+3y+z=18,4x-3y+5y=24,求x+3y的值. 已知x、y满足二分之一,｜x-y｜+｜1-y｜=0,求7x-3y的值