Question

8 Dê o valor das expressões numéricas: a-) 3/4×(2/5+1/2) b-) 2/3×3/5+7/8 c-) 2-(3/5×7/8) d-) 3×(5/4-3/8)​ e-) (4/3-1/2)² + 4 f-) 1/2x(5-7/2)³

Answer 1

Resposta:

Dê o valor das expressões numéricas:

a)

3/4 × (2/5 + 1/2)

3/4 × (4 + 5/10)

3/4 × 9/10

27/40

b)

2/3 × 3/5 + 7/8

2 × 1/5 + 7/8

2/5 +7/8⇒mmc = 40

16/40 + 35/40

51/40

c)

2 - (3/5 × 7/8)

2 - 21/40⇒mmc = 40

80/40 - 21/40

59/40

d)

3 × (5/4 - 3/8)

3 × (10 - 3/8)

3 × 7/8

21/8

Explicação passo-a-passo:

Answer 2

Resposta:

a)

$\frac{3}{4} .( \frac{2}{5} + \frac{1}{2} ) = \frac{3}{4} . \frac{4 + 5}{10} = \frac{3}{4} . \frac{9}{10} = \frac{27}{40}$

b)

$\frac{2}{3} . \frac{3}{5} + \frac{7}{8} = \frac{6}{15} + \frac{7}{8} = \frac{2}{5} + \frac{7}{8} = \frac{16 +35 }{40} = \frac{51}{40}$

c)

$2 - ( \frac{3}{5} . \frac{7}{8} ) = 2 - \frac{21}{40} = \frac{80 - 21}{40} = \frac{59}{40}$

d)

$3.( \frac{5}{4} - \frac{3}{8} ) = 3. \frac{10 - 3}{8} = \frac{3.7}{8} = \frac{21}{8}$

e)

${ (\frac{4}{3} - \frac{1}{2} ) }^{2} + 4 = ( \frac{8 - 3}{6} )^{2} + 4 = \frac{25}{36} + 4 = \frac{169}{36}$

O F eu deixo pra você tentar fazer!