4x+3y=5 x-2y=4
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4x+3y=5x-2y=44x+3y=5x-2y=44x+3y=5x-2y=4x-2y=4x=4+2y代入4x+3y=5中有4*（4+2y)+3y=516+8y+3y=511y=-11y=-1将y=-
4x+3y=5 x-2y=4
4x+3y=5 x-2y=4
4x+3y=5 x-2y=4
x-2y=4 x=4+2y 代入4x+3y=5中 有 4*（4+2y)+3y=5 16+8y+3y=5 11y=-11 y=-1 将y=-1代入到x-2y=4中,得 x-2*(-1)=4 x+2=4 x=2 所以 x=2 y=-1
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)=
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
3X=5Y （X+Y)*3X=(2Y+X)*4+2*2
（5x+3y)(3y-5x)-(4x-y)(4y+x)=
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
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/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
（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