Question

Me ajudem e para amanhã pfff

Answer 1

A) 1) Aplicar o m.m.c

5/7 - (2/3)= 5/7 - 2/3 ( mudou o sinal porque tem um sinal de negativo na frente) = 5/7-2/3= 15-14/21= 1/21

B) 2/3 - 1/2 = 4-3/6 = 1/6

C) 2/3 - 4/5 = 10-12/15 = -2/15

D)-7/8 + 3/4= -7 +6 /8= -1/8

E) -2/5 + 1/4= -8 +5/ 20= -3/20

F) -1/2 -5/8= -4 -5 /8 = -9/8

G) 2/3 -1/5= 10-3/15 = 7/15

H) -2/5 -1/2= -4-5/10 = -9/10