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" If the product of two quantities is equal to the product of two others, either two may be made the extremes of a proportion and the other two the means. For, if ad = bc, then, divide by bd. т~, - г~;« bd bd а с 01 6 = 5 "
New School Algebra - Σελίδα 310
των G.A. Wentworth - 1901
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