Question

determine os respectivos valores de e A e B e, em seguida, calcule A+B

a) A=9/10 + 3/2 - 2/5 + 2; B = 2/12 + 7/8 + 1/4

b) A = 4/5 - 1/10 - 2/5 ; B = 2/3 - 1/4

c) A = 3 - 1/2 ; B = A - 3/4​

Answer 1

Explicação passo-a-passo:

A)

$\dfrac{9}{10} + \dfrac{3}{2} - \dfrac{2}{5} + 2$

$\dfrac{9 + 15 - 4 + 20}{10}$

$\dfrac{40}{10}$

$4$

B)

$\dfrac{2}{12} + \dfrac{7}{8} + \dfrac{1}{4}$

$\dfrac{2 {}^{ \div 2} }{12 {}^{ \div 2} } + \dfrac{7}{8} + \dfrac{1}{4}$

$\dfrac{1}{6} + \dfrac{7}{8} + \dfrac{1}{4}$

$\dfrac{4 + 21 + 6}{24}$

$\dfrac{31}{24}$

A+B

$4 + \dfrac{31}{24}$

$\dfrac{96 + 31}{24}$

$\dfrac{127}{24}$ >>> resposta

A)

$\dfrac{4}{5} - \dfrac{1}{10} - \dfrac{2}{5}$

$\dfrac{4 - 2}{5} - \dfrac{1}{10}$

$\dfrac{2}{5} - \dfrac{1}{10}$

$\dfrac{4 - 1}{10}$

$\dfrac{3}{10}$

B)

$\dfrac{2}{3} - \dfrac{1}{4}$

$\dfrac{8 - 3}{12}$

$\dfrac{5}{12}$

A+B

$\dfrac{3}{10} + \dfrac{5}{12}$

$\dfrac{18 + 25}{60}$

$\dfrac{43}{60}$ >>> resposta

A)

$3 - \dfrac{1}{2}$

$\dfrac{6 - 1}{2}$

$\dfrac{5}{2}$

B)

$a - \dfrac{3}{4}$

A+B

$\dfrac{5}{2} + a - \dfrac{3}{4}$

$\dfrac{5}{2} - \dfrac{3}{4} + a$

$\dfrac{10 - 3}{4} + a$

$\dfrac{7}{4} + a$>>> resposta