4x-3y=5 2x-y=2
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4x-3y=52x-y=24x-3y=52x-y=24x-3y=52x-y=24x-3y=52x-y=2(1)-2*(2)得-y=1y=-1得x=1/22x-y=2两边乘以24x-2y=4这个式子减去
4x-3y=5 2x-y=2
4x-3y=5 2x-y=2
4x-3y=5 2x-y=2
4x-3y=5
2x-y=2
(1)-2*(2)得
-y=1
y=-1
得 x=1/2
2x-y=2 两边乘以2 4x-2y=4 这个式子减去4x-3y=5 则y=-1 x=二分之一
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
3X=5Y （X+Y)*3X=(2Y+X)*4+2*2
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
x*x+2x+y*y-4y+5=0 x= y=
2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20