6x-5y=-2 5x+6y=-22

6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 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 已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y 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 {(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]=2 解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2() 解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6 解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12