6x/5+y=53,4y/5+x=43

（5x+3y)(3y-5x)-(4x-y)(4y+x)= 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 已知：4x = 5y,求(x+y) ：y x-y+5x-4x= ? 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 4x-2y-6y*-y-3x+5y* *=2 就是平方 若5x+3y=3x+4y=x+2y+6,则x+y=___ x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组 解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2() 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12