2：3：5=X:6:Y

6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 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 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 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=___ 已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y 解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6 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