Question

Subtração de fração denominadores diferentes
A)⅓ + ⅖
B)⁴/³ + ⁸/¹⁰
C) ⅖ + ³/⁶
D)⁶/⁷ - ⁹/⁷​

Answer 1

Resposta:

a) 11/15

b) 32/15

c) 27/30

d) - 3/7

Explicação passo a passo:

a)

$\frac{1}{3}+\frac{2}{5}=\\\\=\frac{5+3\:.\:2}{15}\\\\=\frac{5+6}{15}\\\\=\frac{11}{15}$

b)

$\frac{4}{3}+\frac{8}{10}=\\\\=\frac{10\:.\:4+3\cdot 8}{30}\\\\=\frac{40+24}{30}\\\\=\frac{64}{30}\\\\=\frac{32}{15}$

c)

$\frac{2}{5}+\frac{3}{6}=\\\\=\frac{6\:.\:2+5\:.\:3}{30}\\\\=\frac{12+15}{30}\\\\=\frac{27}{30}$

d)

$\frac{6}{7}-\frac{9}{7}=\\\\=\frac{6-9}{7}\\\\=-\frac{3}{7}$