{5x-3y=4 x+6y=3 {3x-2y=4 2x-5y=9
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{5x-3y=4x+6y=3{3x-2y=42x-5y=9{5x-3y=4x+6y=3{3x-2y=42x-5y=9{5x-3y=4x+6y=3{3x-2y=42x-5y=9{5x-3y=4(1)x+
{5x-3y=4 x+6y=3 {3x-2y=4 2x-5y=9
{5x-3y=4 x+6y=3 {3x-2y=4 2x-5y=9
{5x-3y=4 x+6y=3 {3x-2y=4 2x-5y=9
{5x-3y=4 (1)
x+6y=3 (2)
(1)×2+(2),
11x=11
x=1
代入(2),
1+6y=3
y=1/3
方程组的解为x=1,y=1/3
{3x-2y=4 (1)
2x-5y=9 (2)
(1)×5-(2)×2
11x=2
x=2/11
代入(1),
6/11-2y=4
y=-19/11
方程组的解为x=2/11,y=-19/11
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
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
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
(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
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
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
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)
{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0