{3x-y-3=0 {4x+y=17
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{3x-y-3=0 {4x+y=17
天啦!是初中的写法啊麻烦啦啊 要写我看得懂的啊
天啦!是初中的写法啊麻烦啦啊 要写我看得懂的啊
![{3x-y-3=0 {4x+y=17](/uploads/image/z/15856215-15-5.jpg?t=%7B3x-y-3%3D0+%7B4x%2By%3D17)
由1式得出y=3x-3,作为3式;
将3式代入2式,得出4x+3x-3=17,即7x=20,即x=20/7:;
所以,y=3x-3=3x20/7-3=60/7-3=39/7;
将3式代入2式,得出4x+3x-3=17,即7x=20,即x=20/7:;
所以,y=3x-3=3x20/7-3=60/7-3=39/7;
设x,y满足约束条件x>=0 y>=x 4x+3y
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
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
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.