 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 310των G. A. Wentworth - 1898Πλήρης προβολή - Σχετικά με αυτό το βιβλίο
 | Joseph Ray - 1848 - 252 σελίδες
...not equal to 8X2, we infer that the proportion is false. ART. 245.— PROPOSITION II.— Conversely, If the product of two quantities is equal to the product of two others, two of them may be made the means, and the other two the extremes of a proportion. Let bc=ad. Dividing... | |
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