x/y=4/3,求xy-3y²/x²-9y²的值
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x/y=4/3,求xy-3y²/x²-9y²的值
x/y=4/3,求xy-3y²/x²-9y²的值
x/y=4/3,求xy-3y²/x²-9y²的值
x/y=4/3,
xy-3y²/x²-9y² 分子分母同除以y²,得
=(x/y-3)/(x²/y²-9)
=(4/3-3)÷(16/9-9)
=(12-27)÷(16-81)
=-15÷(-65)
=3/13