1995X=1996Y,73X-74Y=1922;巧消常数项法7x+23y=10;17X+16Y=20；

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1995x=1996y
1995x-1995y=y
1995(x-y)=y.①
73x-74y=1922
73x-73y=1922+y
73(x-y)=1922+y.②
①-②,得1922(x-y)=-1922
x-y=-1
x=y-1
∴1995(y-1)=1996y
y=-1995.
∴x=-1996.
(联立不起来- -电脑上打不出)
7x+23y=10.③
17x+16y=20.④
④-2×③,得
3x-30y=0
x=10y.
∴x=100/93,y=10/93.

x+y=5; x^y+y^x=17 X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y) 用消常数项法解:7x-8y=22,3x-5y=11 二元函数f(x,y)=x+y/x-y,求f(y/x,x/y) [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 ) y=cos(x-y) 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 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 已知/x/+x+y=10,/y/+x-y=12.求x+y的值若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于