已知:x/y=2/3求x2-3xy+2y2/2x2-3xy+7y2的值
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X/Y=2/3,则X=2Y/3,
设Y=3t,则X=2t
X²-3XY+2Y²/2X²-3XY+7Y²
=(4t²-6t²+18t²)/(8t²-6t²+63t²)
=16t²/65t²
=16/65
设Y=3t,则X=2t
X²-3XY+2Y²/2X²-3XY+7Y²
=(4t²-6t²+18t²)/(8t²-6t²+63t²)
=16t²/65t²
=16/65
追问
....不对啊 答案应该是4/53啊
。。。我会算了。。
X/Y=2/3,则X=2Y/3,
设Y=3t,则X=2t
X²-3XY+2Y²/2X²-3XY+7Y²
=(4t²-18t²+18t²)/(8t²-18t²+63t²)
=4t²/53t²
=4/53
虽然你没回答对 但还是谢谢了
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