二元一次方程。求解。忘记了。

由(x+y)0.37=x
知0.63x=0.37y
则x=(37y)/63
代入x/2.65+y/2.7=751.81
得(37y)/(63*2.65)+y/2.7=751.81
(37y)/166.95+y/2.7=751.81
通分得：(99.9y+166.95y)/450.765=751.81
则： 266.85y/450.765=751.81
x=745.85130354131534569983136593592
y=1269.9630303541315345699831365936

（X+Y）*0.37=X
0.37X+0.37Y=X
0.37Y=0.63X
Y=0.63/0.37*X
代入第一个式子
X/2.65+0.63/0.37*X/2.7=751.81
然后就可以把X解出来了
X=608.33
Y=2738.50

1)x/2.65+y/2.7=751.81
2)(x+y)0.37=x
由2）得0.63x=0.37y
3)x=37/63y
将3）代入1）：37y/63*2.65+y/2.7=751.81
37y/166.95+y/2.7=751.81
通分得：(99.9y+166.95y)/450.765=751.81
则： 266.85y/450.765=751.81
x=745.8513
y=338889.63465/266.85=67777.92693/53.37=1269.963

X+Y）*0.37=X
0.37X+0.37Y=X
0.37Y=0.63X
Y=0.63/0.37*X
代入第一个式子
X/2.65+0.63/0.37*X/2.7=751.81
X=608.33
Y=2738.50

0.37x+0.37y-x=0
0.63x=0.37y