1.{3x-2y=6,2x+3y=172.{5x+2y=5a,3x+4y=3a(其中a为常数)3.已知{2x+3y=k,3x+4y=2k+6的解满足x+y=3,求k的值
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![1.{3x-2y=6,2x+3y=172.{5x+2y=5a,3x+4y=3a(其中a为常数)3.已知{2x+3y=k,3x+4y=2k+6的解满足x+y=3,求k的值](/uploads/image/z/5071817-65-7.jpg?t=1.%EF%BD%9B3x-2y%3D6%2C2x%2B3y%3D172.%EF%BD%9B5x%2B2y%3D5a%2C3x%2B4y%3D3a%EF%BC%88%E5%85%B6%E4%B8%ADa%E4%B8%BA%E5%B8%B8%E6%95%B0%EF%BC%893.%E5%B7%B2%E7%9F%A5%EF%BD%9B2x%2B3y%3Dk%2C3x%2B4y%3D2k%2B6%E7%9A%84%E8%A7%A3%E6%BB%A1%E8%B6%B3x%2By%3D3%2C%E6%B1%82k%E7%9A%84%E5%80%BC)
1.{3x-2y=6,2x+3y=172.{5x+2y=5a,3x+4y=3a(其中a为常数)3.已知{2x+3y=k,3x+4y=2k+6的解满足x+y=3,求k的值
1.{3x-2y=6,2x+3y=17
2.{5x+2y=5a,3x+4y=3a(其中a为常数)
3.已知{2x+3y=k,3x+4y=2k+6的解满足x+y=3,求k的值
1.{3x-2y=6,2x+3y=172.{5x+2y=5a,3x+4y=3a(其中a为常数)3.已知{2x+3y=k,3x+4y=2k+6的解满足x+y=3,求k的值
1.消元,代入,加减
2.27
3.-2,-7
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
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
(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
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x+y)(2x-3y)=?
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.解方程组