Question

Efetue as adições e subtrações e, se possível, simplifique o resultado:

a) 7/10 + 1/4

b) 3/4 - 6/8

c) 1/8 + 1/12

d) 3/20 - 2/15

Me ajudem pfv

Answer 1

Resposta:

Explicação passo a passo:

$a)\ \frac{7}{10} + \frac{1}{4}\\\\MMC = 2*2*5=20\\\\\frac{7*2}{20} + \frac{1*5}{20}\\\\\frac{14+5}{20}\\\\\frac{19}{20}\\\\b)\ \frac{3}{4} - \frac{6}{8}\\\\MMC = 8\\\frac{3*2}{8} - \frac{6*1}{8}\\\\\frac{6-6}{8}\\\\\frac{0}{8}\\\\0\\\\c)\ \frac{1}{8} + \frac{1}{12}\\\\MMC= 24\\\\\frac{1*3}{24}+\frac{1*12}{24}\\\\ \frac {3+12}{24}\\\\\frac{15}{24}\\\\\frac{5}{8}\\\\d)\ \frac{3}{20}-\frac{2}{15}\\\\MMC = 60\\\\\frac{3*3}{60}-\frac{2*4}{60}\\\\\frac{9*8}{60}\\\\\frac{1}{60}$