x+y+2x=17 x+y+5y=17
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x+y+2x=17 x+y+5y=17
x+y+2x=17 x+y+5y=17
x+y+2x=17 x+y+5y=17
1式减2式,2x-5y=0,2x=5y
x+y=5; x^y+y^x=17
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
换元法解方程组3/x+y+2/x-y=17/5 2/x+y-5/x-y=1
初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
x+y+2x=17 x+y+5y=17
6x+5Y=31 2X+3Y=17求X求 Y
(3x+2y)+(5x-y)i=17-2i.求x与y
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
2(x-y)=5y,x-y=-5
x-y / 5y= (y-x)^2 / ( )
x*x+2x+y*y-4y+5=0 x= y=
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11