Question

a) (-4/5)-(-1/8) b) (+3,8)+(+5,72) c) (-1,75)+(-3,84) d) (+5,5)-(+8,13) e) (-4,72)-(-0,28)

Answer 1

a) (-4/5)-(-1/8) 
mmc(5,8)=40
((-4)(8)-(-1)(5))/40=(-32+5)/40=-27/40

b)(+3,8)+(+5,72)=3,8+5,72=9,52

c)(-1,75)+(-3,84)=-1,75-3,84=-5,59

d) (+5,5)-(+8,13)=5,5-8,13=-2,63

e) (-4,72)-(-0,28)=-4,72+0,28=5,0