已知(3a-b)/(2b-a)=7,(x+y)/(2x-y)=5,求(3ax-by)/(ax+2by)3a-b=7(2b-a),a=3/2b,x+y=5(2x-y),x=2/3y∴ax-2by/ax+2by=by-2by/by+2by……帮我找找哪错了,接下来该怎么写
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![已知(3a-b)/(2b-a)=7,(x+y)/(2x-y)=5,求(3ax-by)/(ax+2by)3a-b=7(2b-a),a=3/2b,x+y=5(2x-y),x=2/3y∴ax-2by/ax+2by=by-2by/by+2by……帮我找找哪错了,接下来该怎么写](/uploads/image/z/5243950-46-0.jpg?t=%E5%B7%B2%E7%9F%A5%283a-b%29%2F%EF%BC%882b-a%EF%BC%89%3D7%2C%EF%BC%88x%2By%EF%BC%89%2F%EF%BC%882x-y%29%3D5%2C%E6%B1%82%283ax-by%29%2F%28ax%2B2by%293a-b%3D7%282b-a%29%2Ca%3D3%2F2b%2Cx%2By%3D5%282x-y%29%2Cx%3D2%2F3y%E2%88%B4ax-2by%2Fax%2B2by%3Dby-2by%2Fby%2B2by%E2%80%A6%E2%80%A6%E5%B8%AE%E6%88%91%E6%89%BE%E6%89%BE%E5%93%AA%E9%94%99%E4%BA%86%2C%E6%8E%A5%E4%B8%8B%E6%9D%A5%E8%AF%A5%E6%80%8E%E4%B9%88%E5%86%99)
已知(3a-b)/(2b-a)=7,(x+y)/(2x-y)=5,求(3ax-by)/(ax+2by)3a-b=7(2b-a),a=3/2b,x+y=5(2x-y),x=2/3y∴ax-2by/ax+2by=by-2by/by+2by……帮我找找哪错了,接下来该怎么写
已知(3a-b)/(2b-a)=7,(x+y)/(2x-y)=5,求(3ax-by)/(ax+2by)
3a-b=7(2b-a),a=3/2b,x+y=5(2x-y),x=2/3y
∴ax-2by/ax+2by=by-2by/by+2by……
帮我找找哪错了,接下来该怎么写
已知(3a-b)/(2b-a)=7,(x+y)/(2x-y)=5,求(3ax-by)/(ax+2by)3a-b=7(2b-a),a=3/2b,x+y=5(2x-y),x=2/3y∴ax-2by/ax+2by=by-2by/by+2by……帮我找找哪错了,接下来该怎么写
其实你已经基本做出来了,就差一点了,得到(by-2by)/(by+2by)=-by/3by=-1/3,把by当成一个整体就行
∴ax-2by/ax+2by=by-2by/by+2by……
应该是3ax-2by/ax+2by=3by-2by/by+2by=1/3
3a-b=7(2b-a),所以a=3/2b,x+y=5(2x-y),所以x=2/3y
∴(3ax-by)/(ax+2by)=(3*3/2b*2/3y
-by)/(3/2b*2/3y+2by)=2by/3by=2/3
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