Question

Respondam essa atividade, tenho que entregar hoje 1) Calcule: A) 5/6+3/4-7/8= B) ×+5/5+2×-3/10-3×+6/4= 2) Escreva na forma de porcentagem: a) 1/8= b) 9/6 c) 0,345= 3) Calcule: a) 34% de 5%= b) 75% de 44%= c) 90% de 65%=

Answer 1

1)

a)

$\mathsf{\dfrac{5}{6}+\dfrac{3}{4}-\dfrac{7}{8}=\dfrac{20+18-21}{24}=\dfrac{17}{24}}$

b)

$\mathsf{\dfrac{5}{5}+2\times(-\dfrac{3}{10})+\dfrac{6}{4}}\\\mathsf{\dfrac{5}{5}-\dfrac{3}{5}+\dfrac{6}{4}=\dfrac{20-12+30}{20}=\dfrac{38}{20}}$

$\mathsf{\dfrac{19}{10}}$

2)

a)

$\mathsf{\dfrac{1}{8}=0,125\times100=12,5\%}$

b)

$\mathsf{\dfrac{9}{6}=1,5\times100=150\%}$

c)

$\mathsf{0,345\times100=34,5\%}$

3)

a)

$\mathsf{34\%\,de\,5\%=0,34.0,05=0,017=1,7\%}$

b)

$\mathsf{75\%\,de\,44\%=0,75.0,44=0,33=33\%}$

c)

$\mathsf{90\%\,de\,65\%=0,9.0,65=0,585=58,5\%}$