2x²-3xy-5y²=0则x除y=
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2x²-3xy-5y²=0则x除y=
2x²-3xy-5y²=0则x除y=
2x²-3xy-5y²=0则x除y=
(x+y)(2x-5y)=0
x+y=0
2x-5y=0
x=-y
2x=5y
x/y=-1或者x/y=5/2
原式=2x²+2xy-5xy-5y²
=2x(x+y)-5y(x+y)
=(x+y)(2x-5y)