5x+6y=39 6x -2y=10
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5x+6y=39 6x -2y=10
![5x+6y=39 6x -2y=10](/uploads/image/z/3010369-49-9.jpg?t=5x%2B6y%3D39+6x+-2y%3D10)
5x+6y=39,①
6x-2y=10,②
将②×3,得
18x-6y=30,③
①+③,得
23x=69.
解得x=3.
将x代入①(或②,任意一个都行),得
5×3+6y=39.
所以y=4.
所以x=3,
y=4.
6x-2y=10,②
将②×3,得
18x-6y=30,③
①+③,得
23x=69.
解得x=3.
将x代入①(或②,任意一个都行),得
5×3+6y=39.
所以y=4.
所以x=3,
y=4.
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y
3x+2y=6 ,5x+6y=10那么x+y=?
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
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)-4(x-y)=4 {x+y/2 + x-y/6=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
1.4Y=X 5X+6Y=39