Question

解方程组.x+y分之2-x-y分之1=3,x+y分之3+x-y分之4=10.

Answer 1

假设：m=1/(x+y),n=1/(x-y)

2m-n=3,

3m+4n=10

m=2,n=1

x+y=1/2,x-y=1

x=3/4,y=-1/4