方程组x+y=5x-y=1

解方程组:x+y=2x+y+1=5x+2y+1解方程组:x+y=2x+y+1=5x+2y+1解方程组:x+y=2x+y+1=5x+2y+1解得答案是x=-1;y=3x+y=2x+y+1x=-12x+y

方程组x²-y²-3x+5y=0,x-y-1=0方程组x²-y²-3x+5y=0,x-y-1=0方程组x²-y²-3x+5y=0,x-y-1

解关于X,Y的方程组{x+y=a（a-1)x+y=5解关于X,Y的方程组{x+y=a（a-1)x+y=5解关于X,Y的方程组{x+y=a（a-1)x+y=5x+y=a(1)(a-1)x+y=5(2)(

非常简单的1道方程组方程组5X-Y=4X+Y=8非常简单的1道方程组方程组5X-Y=4X+Y=8非常简单的1道方程组方程组5X-Y=4X+Y=8y=5x-4代入x+y=8两试相加：6X=12所以X=2

解方程组(x+y)(x-2y)=-5(x-y)(x+2y)=7解方程组(x+y)(x-2y)=-5(x-y)(x+2y)=7解方程组(x+y)(x-2y)=-5(x-y)(x+2y)=7展开x^2-2

解方程组{(x-2)(y+3)=(x+1)(y-1){(x+1)(y+1)=(x-1)(y+5)解方程组{(x-2)(y+3)=(x+1)(y-1){(x+1)(y+1)=(x-1)(y+5)解方程组

换元法解方程组3/x+y+2/x-y=17/52/x+y-5/x-y=1换元法解方程组3/x+y+2/x-y=17/52/x+y-5/x-y=1换元法解方程组3/x+y+2/x-y=17/52/x+y

10/x+y+3/x-y=-515/x+y-2/x-y=-1（用换元法解此方程组）10/x+y+3/x-y=-515/x+y-2/x-y=-1（用换元法解此方程组）10/x+y+3/x-y=-515/

解方程组6(x-y)-7(x+y)=212(x-y)-5(x+y)=-1解方程组6(x-y)-7(x+y)=212(x-y)-5(x+y)=-1解方程组6(x-y)-7(x+y)=212(x-y)-5

解方程组3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1解方程组3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1解方程组3(x+y)-2(x-y)=9,5(x+y)+2

3/(X-Y)+10/(X+Y)=-52/(X-Y)-15/(X+Y)=1解分式方程组3/(X-Y)+10/(X+Y)=-52/(X-Y)-15/(X+Y)=1解分式方程组3/(X-Y)+10/(X+

是两元一次方程组｛6(x-y)-7(x+y)=212(x-y)-5(x+y)=-1是两元一次方程组｛6(x-y)-7(x+y)=212(x-y)-5(x+y)=-1是两元一次方程组｛6(x-y)-7(

解方程组:{3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1}解方程组:{3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1}解方程组:{3(x+y)-2(x-y)=9,

解方程组2x-y=52y/x-x/y=12x-y=52y/x-x/y=1解方程组2x-y=52y/x-x/y=12x-y=52y/x-x/y=1解方程组2x-y=52y/x-x/y=12x-y=52y

解方程组:{x+y=3,x-y=5解方程组:{x+y=3,x-y=5解方程组:{x+y=3,x-y=5由(1)得x=3-y(3)把(3)代入(2)得3-y-y=5∴y=-1把y=-1代入(3)得x=4

解方程组{x+y=1x-5=5解方程组{x+y=1x-5=5解方程组{x+y=1x-5=5x=10y=-9x=10y=-9x-5=5则x=5+5=10y=1-x=1-10=-910x=10y=1-10

解二元一次方程组x+y=31/2(x+y)-3y=5解二元一次方程组x+y=31/2(x+y)-3y=5解二元一次方程组x+y=31/2(x+y)-3y=5解将x+y=3代入1/2(x+y)-3y=5

解方程组x+y（y加绝对值）=-1,3x-5y=-11解方程组x+y（y加绝对值）=-1,3x-5y=-11解方程组x+y（y加绝对值）=-1,3x-5y=-11x+|y|=-1.(1)3x-5y=-

X-Y=3(y-2),2(x-1)=5Y-18解下列方程组X-Y=3(y-2),2(x-1)=5Y-18解下列方程组X-Y=3(y-2),2(x-1)=5Y-18解下列方程组x-y=3y-6x=4y-

方程组4x+5y=7,y+1=6-y-6x方程组4x+5y=7,y+1=6-y-6x方程组4x+5y=7,y+1=6-y-6x4x+5y=7(1)(1)*2,得8x+10y=14(3)6x+2y=5(