求值:x+3y分之x-2y,3x-5y=0

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求值:x+3y分之x-2y,3x-5y=0

求值:x+3y分之x-2y,3x-5y=0
求值:x+3y分之x-2y,3x-5y=0

求值:x+3y分之x-2y,3x-5y=0
3x-5y=0
3x=5y
x/y=5/3
(x-2y)/(x+y)
=(x/y-2y/y)/(x/y+y/y)
=(x/y-2)/(x/y+1)
=(5/3-2)/(5/3+1)
=(-1/3)/(8/3)
=-1/3*3/8
=-1/8

3x=5y
(x-2y)/(x+3y)
=(5/3y-2y)/(5/3y+3y)
=-1/14