2X+5Y=19 6X-2Y=6 问：X=?Y=?
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2X+5Y=196X-2Y=6问：X=?Y=?2X+5Y=196X-2Y=6问：X=?Y=?2X+5Y=196X-2Y=6问：X=?Y=?2X+5Y=19(1)6X-2Y=6(2)(1)×2+(2)×
2X+5Y=19 6X-2Y=6 问：X=?Y=?
2X+5Y=19 6X-2Y=6 问：X=?Y=?
2X+5Y=19 6X-2Y=6 问：X=?Y=?
2X+5Y=19 (1)
6X-2Y=6 (2)
(1)×2+(2)×5
4X+10Y+30X-10Y=38+30
34X=68
X=2
Y=(6X-6)/2=3
2X+5Y=19①
6X-2Y=6②
①x3-②:17Y=51 Y=3
Y=3带入① 2X+15=19 X=2
2x＋5y＝19的两边乘以3，然后与6x－2y＝6两边一减得6x＋15y－（6x－2y）＝57－6，17y＝51，y＝3，那么x＝2
2X+5Y=19 6X-2Y=6 问：X=?Y=?
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
x@y=(x+y)除以2,X#Y=3X-Y除以2 问：(9@x）#30=6,求x的值.
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
X/Y=2/5 X+60/Y=4/7 问X.Y各是多少
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
3x+5y-(x+y)=6 2(x+y)-3x=-7
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
[(2x-y)(2x+y)+y(y-6x)]÷2x=?
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=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
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于