Question

Calcule as operações com fracoes:


b)1/3+2/5


c)3/4+5/6-1/2


d)4-1/7


e)3/4×1/2


f)4/5÷2/3


g)10/3÷5/9


h)(1/2)³

Answer 1

$\frac{1}{3} + \frac{2}{5} = \frac{5 \times 1 + 3 \times 2}{5 \times 3} = \frac{11}{15} \\..................................... \\ \frac{1}{4} + \frac{5}{6} - \frac{1}{2} = ( \frac{6 \times 1 + 4 \times 5}{4 \times 6} ) - \frac{1}{2} \\ \\ = \frac{26}{24} - \frac{1}{2} = \frac{13}{12} - \frac{1}{2} = \frac{2 \times 13 + 12 \times 1}{12 \times 2} \\ \\ = \frac{38}{24} = \frac{19}{12} \\............................................. \\ = 4 - \frac{1}{7} = \frac{7 \times 4 - 1}{7} = \frac{27}{7} \\ ............................................. \\ \frac{3}{4} \times \frac{1}{2} = \frac{3}{8} \\ ............................................. \\ \frac{ \frac{4}{5} }{ \frac{2}{3} } = \frac{4}{5} \times \frac{3}{2} = \frac{12}{10} = \frac{6}{5} \\ ............................................ \\ \frac{ \frac{10}{3} }{ \frac{5}{9} } = \frac{10}{3} \times \frac{9}{5} = \frac{90}{15} = \frac{18}{3} \\ ............................................. \\ (\frac{1}{2} ) {}^{3} = \frac{1^3}{ {2}^{3} } = \frac{1}{8}$

Answer 2

Olá, bom dia ☺

Resoluções:

a)

1/3+2/5

m.m.c=15

(5+6)/15=11/15

b)

3/4+5/6-1/2

m.m.c=12

(9 + 10 - 6)/12 = 13/12

c)

4-1/7

(7×4-1)/7

= 27/7

d)

3/4×1/2

=3/8

e)

(4/5)/(2/3)

4/5 × 3/2 = 12/10 = 6/5

Bons Estudos :)