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Ejercicio de PSU sobre operatoria en Q

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1)  Considere las siguientes expresiones:

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     $A=$$\\Large \\frac{\\var{a}}{\\var{c}}$$+$$\\Large \\frac{\\var{b}}{\\var{c}}$

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     $B=$$\\Large \\frac{\\var{d}}{\\var{f}}$$\\cdot$$\\Large \\frac{\\var{g}}{\\var{h}}$

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     $C=$$\\Large \\frac{\\var{m}}{\\var{n}}$$:$$\\Large \\frac{\\var{o}}{\\var{p}}$

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En cual de las siguientes alternativas se encuentra el desarrollo y valor correcto de cada expresión:

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[[0]]

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\n

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Para desarrollar la expresión $A$ observamos que sus denominadores son iguales, por tanto, solo debemos sumar sus numeradores; luego simplificamos en caso de ser necesario.

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                                 [[0]]

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$A=$ $\\Large \\frac{\\var{a}}{\\var{c}}$$+$$\\Large \\frac{\\var{b}}{\\var{c}}$ $=$ ______ $=$ [[2]]

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                                 [[1]]

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\n

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Para desarrollar la expresión $B$ multiplicamos numerador con numerador y denominador con denominador; luego simplificamos en caso de ser necesario.

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                               [[0]]

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$B=$$\\Large \\frac{\\var{d}}{\\var{f}}$$\\cdot$$\\Large \\frac{\\var{g}}{\\var{h}}$ $=$ _______ $=$ [[2]]

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                               [[1]]

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Para desarrollar la expresión $C$ debemos determinar la primera fracción multiplicada por la segunda fracción invertida, luego multiplicamos  numerador con numerador y denominador con denominador, finalmente simplificamos en caso de ser necesario.

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                                 [[0]] [[3]]  [[4]]

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$C=$$\\Large \\frac{\\var{m}}{\\var{n}}$$:$$\\Large \\frac{\\var{o}}{\\var{p}}$ $=$ _______ $\\cdot$ _______ $=$ _______ $=$ [[6]]

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                                 [[1]] [[2]]  [[5]]

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\n

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