Question

Calcule o valor das expressões e apresente o resultado na forma de fração irredutivel a) o,5 + 1/4 . 1/3 b) 1/2 +1/3 : 5/6 c) 1/4 . 0,5 + 1/2 d) 15: ( 3/4 - 1/4 e) (3 + 1/2) . 4/5 f) (0,75 + 1/4 ):2/5 + 1/2

Answer 1

A) 0,5=1/2 então:
1/2+1/4 . 1/3= 1/2+ 1/12 = (mmc=12) 6/12+1/12=7/12
B) 1/2+ 1/3 . 6/5= 1/2+ 6/15= (mmc=30) 15/30+12/30= 27/30
C) 1/4 . 1/2 +1/2= 1/8+1/2= (mmc=8) 1/8+4/8=5/8
D) 15: (3/4-1/4=2/4)= 15.4/2= 60/2= 30
E) (3/1+1/2=6/2+1/2=7/2).4/5= 28/10=14/5
F) (75/100+1/4):2/5+1/2= (75/100+25/100=100/100):2/5+1/2=100/100.5/2=500/200+1/2=5/2+1/2(corta os "0s")=6/2