Question

CALCULE O VALOR DAS EXPRESSOES:

a)+12,4-3,2=

b)(-2,3)-(-6,7)=

c)[+2/5]-[-5/9]=

d)[-6/8]-[-3/2]=

Answer 1

a) 9,2
b) -2,3 + 6,7 = 4,4
c) 2/5 + 5/9 = (tira mmc de 9 e 5) (18+25)/45 = 43/45
d) -6/8 + 3/2= (-6+12)/8 = 6/8 = 3/4