Question

Resolva as operações com frações:

A) ( 1 + 3/5) ÷ ( 3 - 3/5) - ( 1 - 1/4) × ( 1 + 1/3)

B) ( 7/2 × 4/14) - [84 - (8/5 + 3/6) + 4/7]

Answer 1

Boa tarde 

A) (1 + 3/5) ÷ (3 - 3/5) - (1 - 1/4) * (1 + 1/3)

calcule cada parcela 

(8/5)/(12/5) - (3/4)"(4/3) 

para dividir duas frações inverte a segunda e multiplique 
 
= (8/5)*(5/12) - 12/12
= 40/60 - 1 = 2/3 - 1 = 2/3 - 3/3 = -1/3

B) ( 7/2 * 4/14) - [84 - (8/5 + 3/6) + 4/7]

28/28 - (84 - 21/10 + 4/7

70/70 - 84*70/70 + 147/70 - 40/70 

(70 - 5880 + 147 - 40)/70 = -5703/70