Question

2- calcule,simplificando quando possível
a)4/8 - 2/8=
b)3/7 - 4/7=
c)2/5 -3/4=
d)5/8- 2/5​

Answer 1

Resposta:

a)

$\dfrac{4}{8} - \dfrac{2}{8} = \dfrac{4 - 2}{8} = \\ \\ \dfrac{2 \div 2}{8 \div 2} = \Large\boxed{ \green{ \bf\dfrac{1}{4} }}$

b)

$\dfrac{3}{7} - \dfrac{4}{7} = \dfrac{3 - 4}{7} = \\ \\ \Large\boxed{ \green{ \bf - \dfrac{ 1}{7} }}$

c)

$\dfrac{2}{5} - \dfrac{3}{4} = \dfrac{4 \times 2 - 5 \times 3}{20} = \\ \\ \dfrac{8 - 15}{20} = \Large\boxed{ \green{ \bf \: - \dfrac{ 7}{20} }}$

d)

$\dfrac{5}{8} - \dfrac{2}{5} = \dfrac{5 \times 5 - 8 \times 2}{40} = \\ \\ \dfrac{25 - 16}{40} = \Large\boxed{ \green{ \bf\dfrac{9}{40} }}$

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