Question

2a-{3a-[2a+b-(3b-c)+(3b+c)-(a+b-c)]} sendo que A=1/4,B=1/5,C=1/3 Me ajudem por favor

Answer 1

1/2 - {3/4 - [14/20 - 4/5 + 14/15 - 17/60]}= 1/2 - {3/4 - [(42-16+56-17)/60]} = 1/2 - {3/4 - [65/60]} = 1/2 - {(45-65/60)} = 1/2 - {-20/60} = 1/2 - {-1/3} = 1/2 + 1/3 = (3+2)/6 = 5/6.