{6x+y=25 9x-3y=6 {6x-7y=19 3x+4y=2
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{6x+y=25 9x-3y=6 {6x-7y=19 3x+4y=2
{6x+y=25 9x-3y=6 {6x-7y=19 3x+4y=2
{6x+y=25 9x-3y=6 {6x-7y=19 3x+4y=2
6x+y=25 .1
9x-3y=6.2
1式*3+2式得:
(18+9)x=25*3+6
27x=81
x=3
y=25-6x=25-18=7
6x-7y=19.3
3x+4y=2.4、
4式*2-3式:
(8+7)y=2*2-19
15y=-15
y=-1
3x+4(-1)=2
3x=6
x=2
所以;X=2,Y=-1
6x+y=25---------1 乘以3,18x+3y=75-------3
9x-3y=6---------2
3式+2式=27x=81,x=3代入1式,y=7
6x-7y=19 ----------1
3x+4y=2------------2乘以2,6x+8y=4-------3
3式-2式=15y=-15,y=-1代入1式,x=2
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
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
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
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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)
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
6(x+y)的平方-11(x+y)(x-y)+3(x-y)的平方=?
已知X*X+Y*Y+6X-8Y+25=0 求(Y/X)+(X/Y)-2=?
x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y
y=-6/x (x
已知6x+2y/9x-3y=6,那么(3x+y)平方/x平方-y平方
解二元一次方程 {3(x+y)-4(x-y)=-9 x+y/2+x-y/6=1