Página — Matematica 8 (pág. 25)

b. Ursula prepara mermelada todos los veranos y la guarda en frascos de \frac{3}{8} kg. Sile regalóa su nieta siete frascos, jcuánta mermelada en total recibió su nieta?

c. En la pizzería de Manuel, cada porción de pizza corresponde a\frac{1}{8} de una pizza grande.Si Lucia compró 12 porciones para compartir con su familia, icuánta pizza adquirió?

d. Marcela utilizó(2\frac{1}{3} paquetes de pan, de 6 unidades cada uno, para preparar completos.iCuántos panes ocupó en total?

e. Florencia tiene un rollo de cinta de 44,55 m y lo debe cortar en 15 trozos iguales para hacer flores y decorar un espejo. iCuántos metros medirá cada trozo?

5. Un estudiante resolvió el siguiente ejercicio y cometió un error. ldentificalo, enciérralo, y luego corrigelo.

\begin{aligned}\frac{1}{2}+\frac{2}{3}\cdot\left(-\frac{4}{5}\right)-1,&\overline{3}=\frac{1}{2}+\frac{2}{3}\cdot\left(-\frac{4}{5}\right)-\frac{4}{3}\\&=\frac{7}{6}\cdot\left(-\frac{4}{5}\right)-\frac{4}{3}\\&=\frac{14}{15}-\frac{4}{3}\\&=\frac{2}{15}\end{aligned}\quad\begin{aligned}&\text{1}{\quad}\quad&\text{2}{\quad}\quad&\text{3}{\quad}\quad&\text{4}{\quad}\quad&\text{5}{\quad}\quad&\text{6}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{6}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{6}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&1{}\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&1{}\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad&1{}\quad{\quad}\quad&1}{\quad}{\quad\quad}&&\text{1}{\quad}{\quad\quad}{\quad}\quad&\text{1}{\quad}{\quad}\quad{\quad}\quad&&\text{1}{}\quad{\quad}\quad&\

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Lección 2 . Números racionales

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