Question

Necessito da conta armada, please ✌
a. -1+1/2+3/8=
b. (-9/2).(-4/7)
c. 2.(-6/8)
d. (0,25)+(-1)
e. (-2,1).(-0,8)​

Answer 1

Resposta:

Explicação passo a passo:

a. -1+1/2+3/8

Mmc (2,8)= 8

= (- 8 + 4 + 3)/8

= (-8+7)/8

= - 1/8

b. (-9/2).(-4/7)

= 9/2 . 4/7

= 36/14 (:2)/(:2)

= 18/7

c. 2.(-6/8)

= -12/8 (:4)/(:4)

= -3/2

d. (0,25)+(-1)

= 0,25 - 1

= - 0,75

e. (-2,1).(-0,8)​

= 2,1 . 0,8

= 21/10 . 8/10

= 168/100

= 1,68

Answer 2

$a) \: \frac{ - 1}{1} + \frac{1}{2} + \frac{3}{8} > mmc = 8 \\ \\ \frac{ - 8}{8} + \frac{4}{8} + \frac{3}{8} = \frac{ - 1}{8}$

$b) \: (\frac{ - 9}{2} ).( \frac{ - 4}{7} ) = \frac{36}{14}$

(Simplificando por 2):

$\frac{36 {}^{ \div 2} }{14 {}^{ \div 2} } = \frac{18}{7}$

$c) \: \frac{2}{1} .( \frac{ - 6}{8} ) = \frac{ - 12}{8}$

(Simplificando por 4)

$\frac{ - 12 {}^{ \div 4} }{8 {}^{ \div 4} } = \frac{ - 3}{2}$

$d) \: (0.25) + ( - 1) = \\ 0.25 - 1 = - 0.75$

$e) \: ( - 2.1).( - 0.8) = 1.68$