Question

Saben cómo se hacen?

Answer 1

Respuesta:

$\frac{63}{90}\:\:=\:\:\frac{9\cdot \:7}{90}=\frac{9\cdot \:7}{9\cdot \:10} =\frac{7}{10}$

$\frac{108}{20}=\frac{27\cdot4}{5\cdot4} =\frac{27}{5}=\frac{2 + 5 \cdot 5}{5}=5\frac{2}{5}$

$\frac{51}{85} =\frac{3 \cdot17}{5\cdot17} =\frac{3}{5}$

2. Realice las operaciones indicadas y simplifique:

$\frac{1}{2} +\frac{1}{2}=\frac{1 + 1}{2}=\frac{2}{2} =1\\\\\\\frac{3}{4} +\frac{7}{2}= \frac{3\cdot1}{4\cdot1}+\frac{7\cdot2}{2\cdot2}=\frac{3}{4} +\frac{14}{4} =\frac{3+14}{4}=\frac{17}{4} =\frac{4\cdot4 + 1}{4} =4\frac{1}{4} \\\\\\\frac{1}{4}+\frac{4}{-5}=\frac{1}{4}-\frac{4}{5}=\frac{5}{20}-\frac{16}{20}=\frac{5-16}{20}=\frac{-11}{20}=-\frac{11}{20}$