由基本性质a/b=c/d可得(a±b)/b=(c±d)/d.那么a/b=(a+c)/(b+d)是如何推得的?如果a/b=c/d=…=m/n(b+d+…+n≠0),那么(a+c+…+m)/(b+d+…+n)=a/b又是怎么推得的?那么a/b=(a+c)/(b+d)是如何推得的?......是重点
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![由基本性质a/b=c/d可得(a±b)/b=(c±d)/d.那么a/b=(a+c)/(b+d)是如何推得的?如果a/b=c/d=…=m/n(b+d+…+n≠0),那么(a+c+…+m)/(b+d+…+n)=a/b又是怎么推得的?那么a/b=(a+c)/(b+d)是如何推得的?......是重点](/uploads/image/z/8585522-26-2.jpg?t=%E7%94%B1%E5%9F%BA%E6%9C%AC%E6%80%A7%E8%B4%A8a%2Fb%3Dc%2Fd%E5%8F%AF%E5%BE%97%EF%BC%88a%C2%B1b%29%2Fb%3D%28c%C2%B1d%29%2Fd.%E9%82%A3%E4%B9%88a%2Fb%3D%28a%2Bc%29%2F%28b%2Bd%29%E6%98%AF%E5%A6%82%E4%BD%95%E6%8E%A8%E5%BE%97%E7%9A%84%3F%E5%A6%82%E6%9E%9Ca%2Fb%3Dc%2Fd%3D%E2%80%A6%3Dm%2Fn%EF%BC%88b%2Bd%2B%E2%80%A6%2Bn%E2%89%A00%EF%BC%89%2C%E9%82%A3%E4%B9%88%EF%BC%88a%2Bc%2B%E2%80%A6%2Bm%29%2F%28b%2Bd%2B%E2%80%A6%2Bn%29%3Da%2Fb%E5%8F%88%E6%98%AF%E6%80%8E%E4%B9%88%E6%8E%A8%E5%BE%97%E7%9A%84%3F%E9%82%A3%E4%B9%88a%2Fb%3D%28a%2Bc%29%2F%28b%2Bd%29%E6%98%AF%E5%A6%82%E4%BD%95%E6%8E%A8%E5%BE%97%E7%9A%84%3F......%E6%98%AF%E9%87%8D%E7%82%B9)
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由基本性质a/b=c/d可得(a±b)/b=(c±d)/d.那么a/b=(a+c)/(b+d)是如何推得的?如果a/b=c/d=…=m/n(b+d+…+n≠0),那么(a+c+…+m)/(b+d+…+n)=a/b又是怎么推得的?那么a/b=(a+c)/(b+d)是如何推得的?......是重点
由基本性质a/b=c/d可得(a±b)/b=(c±d)/d.那么a/b=(a+c)/(b+d)是如何推得的?
如果a/b=c/d=…=m/n(b+d+…+n≠0),那么(a+c+…+m)/(b+d+…+n)=a/b
又是怎么推得的?
那么a/b=(a+c)/(b+d)是如何推得的?......是重点
由基本性质a/b=c/d可得(a±b)/b=(c±d)/d.那么a/b=(a+c)/(b+d)是如何推得的?如果a/b=c/d=…=m/n(b+d+…+n≠0),那么(a+c+…+m)/(b+d+…+n)=a/b又是怎么推得的?那么a/b=(a+c)/(b+d)是如何推得的?......是重点
a/b=c/d 那么a:c=b:d(根据蝴蝶定律),那么(a+c)/(b+d)一定等于a/b.
同样,下式中a:c:e:g.k:m=b:d:f:h.l:n,那么(a+c+…+m)/(b+d+…+n)=a/b.
a/b=c/d=…=m/n=k
a=bk c=dk m=nk
a+c+m=bk+dk+nk,
那么(a+c+…+m)/(b+d+…+n)=a/b
a/b=c/d=…=m/n=A
a=Ab,c=Ad,....
a+c+......+m=A(b+d+.....+n)
(a+c+…+m)/(b+d+…+n)=A=a/b