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答:設這兩個比組成的比例式的內項分別為x,y,那麼:(四分之一):x=y:(九分之一)=一又二分之一=二分之三所以:x=(四分之一)除以(二分之三)=(四分之一)乘以(三分之二)=六分之一y=二分之三乘以九分之一=六…
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