1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²的值.2、3/a=4/b=5/c,求分式 ab-bc+ac/a²+b²+c²的值各位救命啊、明天要交的、解出一题也行
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![1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²的值.2、3/a=4/b=5/c,求分式 ab-bc+ac/a²+b²+c²的值各位救命啊、明天要交的、解出一题也行](/uploads/image/z/980952-24-2.jpg?t=1+%E3%80%81x%2By%3D8+xy%3D6+%E6%B1%82x%26%23178%3B%2B3xy%2B2y%26%23178%3B%2Fx%26%23178%3By%2B2xy%26%23178%3B1+%E3%80%81x%2By%3D8+xy%3D6++%E6%B1%82x%26%23178%3B%2B3xy%2B2y%26%23178%3B%2Fx%26%23178%3By%2B2xy%26%23178%3B%E7%9A%84%E5%80%BC.2%E3%80%813%2Fa%3D4%2Fb%3D5%2Fc%2C%E6%B1%82%E5%88%86%E5%BC%8F+ab-bc%2Bac%2Fa%26%23178%3B%2Bb%26%23178%3B%2Bc%26%23178%3B%E7%9A%84%E5%80%BC%E5%90%84%E4%BD%8D%E6%95%91%E5%91%BD%E5%95%8A%E3%80%81%E6%98%8E%E5%A4%A9%E8%A6%81%E4%BA%A4%E7%9A%84%E3%80%81%E8%A7%A3%E5%87%BA%E4%B8%80%E9%A2%98%E4%B9%9F%E8%A1%8C)
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1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²的值.2、3/a=4/b=5/c,求分式 ab-bc+ac/a²+b²+c²的值各位救命啊、明天要交的、解出一题也行
1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²
1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²的值.
2、3/a=4/b=5/c,求分式 ab-bc+ac/a²+b²+c²的值
各位救命啊、明天要交的、解出一题也行
1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²的值.2、3/a=4/b=5/c,求分式 ab-bc+ac/a²+b²+c²的值各位救命啊、明天要交的、解出一题也行
1 、x+y=8 xy=6 求x²+3xy+2y²/x²y+2xy²的值.
x²+3xy+2y²/x²y+2xy²
=(x+2y)(x+y)/xy(x+2y)
=(x+y)/xy x+y=8 xy=6
=8/6
=4/3
2、3/a=4/b=5/c,求分式 ab-bc+ac/a²+b²+c²的值
∵3/a=4/b=5/c,
∴b=4a/3
c=5a/3
∴ab-bc+ac/a²+b²+c²
=(a*4a/3-4a/3*5a/3+a*5a/3)/(a²+16a²/9+25a²/9)
=(4a²/3-20a²/9+5a²/3)/(50a²/9)
=(27a²/9-20a²/9)/(50a²/9)
=(7a²/9)/(50a²/9)
=7/50