Question

Por favor me ajudem
URGENTEEEE
Calcule :
A) -3/4 + 0,9
B) 3/5 + 1,2
C) -3/5 + 7/8 - 1 + 11/10
D) 4/9 -5/6 -2/3 +3/2

Answer 1

Resposta:

A) -3/4 + 0,9 = 3/20

B) 3/5 + 1,2 = 9/5

C) -3/5 + 7/8 - 1 + 11/10 = 3/8

D) 4/9 -5/6 -2/3 +3/2 = 4/9

Explicação passo-a-passo:

A)

$\dfrac{-3}{4}+\dfrac{9}{10}=\dfrac{-15+18}{20}=\boxed{\dfrac{3}{20}}$

B)

$\dfrac{3}{5}+\dfrac{12}{10}=\dfrac{6+12}{10}=\dfrac{18}{10}=\boxed{\dfrac{9}{5}}$

C)

$-\dfrac{3}{5}+\dfrac{7}{8}-1+\dfrac{11}{10}=\dfrac{-24+35-40+44}{40}=\dfrac{11+4}{40}=\dfrac{15}{40}=\boxed{\dfrac{3}{8}}$

D)

$\dfrac{4}{9}-\dfrac{5}{6}-\dfrac{2}{3}+\dfrac{3}{2}=\dfrac{8-15-12+27}{18}=\dfrac{8}{18}=\boxed{\dfrac{4}{9}}$

Answer 2

a)

$\sf \dfrac{-3}{4}+0,9$

$\sf =-0,75+0,9$

$\sf =\red{+0,15}$

b)

$\sf \dfrac{3}{5}+1,2$

$\sf =0,6+1,2$

$\sf =\red{+1,8}$

c)

$\sf \dfrac{-3}{5}+\dfrac{7}{8}-1+\dfrac{11}{10}$

$\sf =-0,6+0,875-1+1,1$

$\sf =0,275+0,1$

$\sf =\red{+0,375}$

d)

$\sf \dfrac{4}{9}-\dfrac{5}{6}-\dfrac{2}{3}+\dfrac{3}{2}$

$\sf =\dfrac{8-15-12+27}{18}$

$\sf =\dfrac{-7+15}{18}$

$\sf =\dfrac{8}{18}$

$\sf =\red{+\dfrac{4}{9}}$