x+2y=9 3x-2y=-1 5x+2y=25 3x+4y=15 2x+3y=x+2y=9 3x-2y=-1 5x+2y=25 3x+4y=15 2x+3y=6 3x-2y=-2 x+2y=9 3x-2y=-1 解二元一次方程组,要过程
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4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
(x-y)/(x+y)=3求( 3x-2y-1)/(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)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
解方程组 3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1
解方程组:{3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1}
3x(2x+y)-2x(x-y),其中x=1,y=1/5
5x=3y,(2x+y)的平方=5x(x+y)+9
9y=3x-(x-1),4(x+y)-(2x+4)=8y
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2