已知 x/y=2/7 求x²-3XY+2Y²/2X²-3XY+7Y²的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/20 00:52:31
![已知 x/y=2/7 求x²-3XY+2Y²/2X²-3XY+7Y²的值](/uploads/image/z/813777-33-7.jpg?t=%E5%B7%B2%E7%9F%A5+x%2Fy%3D2%2F7+%E6%B1%82x%26%23178%3B-3XY%2B2Y%26%23178%3B%2F2X%26%23178%3B-3XY%2B7Y%26%23178%3B%E7%9A%84%E5%80%BC)
x){}K*+mmlPS6456p"D͡g];ɎOw,y1EC[-}Q e{P/=tBݓ͛lz3}cK<;
已知 x/y=2/7 求x²-3XY+2Y²/2X²-3XY+7Y²的值
已知 x/y=2/7 求x²-3XY+2Y²/2X²-3XY+7Y²的值
已知 x/y=2/7 求x²-3XY+2Y²/2X²-3XY+7Y²的值
令x=2m,y=7m,向所求的试子中带,或者直接把x=2y/7 向里带也行.最后结果是60/309