解方程组（1）2（x+y)-(x-y)=3① (x+y)-2(x-y)=1 ②(2)(x+2)^2-(y-3)^2=(x+y)(x_数学解答

解方程组（1）2（x+y)-(x-y)=3① (x+y)-2(x-y)=1 ②
(2)(x+2)^2-(y-3)^2=(x+y)(x-y)① x-3y=2 ②

人气：278 ℃　时间：2020-06-08 11:00:03

解答

x+y/2+x-y/3=1,4(x+y)-2(x-y)=1
设x+y=a x-y=b
∴a/2+b/3=1
3a+2b=6
4a-2b=1
解得：
a=1
b=3/2
∴x+y=1
x-y=3/2
∴x=5/4
y=-1/4