若2x方+9xy-5y方=0,则x除以y=
人气:303 ℃ 时间:2020-06-03 15:20:49
解答
2x方+9xy-5y方=0
2x^2+9xy=5y^2
2(x/y)^2+9(x/y)-5=0
(2x/y-1)(x/y+5)=0
x/y=1/2,x/y=-5
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