6x-5y=600 5x-6y=60
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
{x=5y 3x+6y=42
5x=6y x比y=?
1.4Y=X 5X+6Y=39
x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9
x+y/2+x-y/3=5/6;x=y/6-x-y/3=1/2
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()
已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y