Question

Coroana+20pct
Calculati

a)(-3/10)-(-5/12)-(+7/20)
b)-3/14+9/28-5/42-1/84
c)1/14-(5/28-1/84)
d)1,1(6)-0,5+1,25-0,(6)-2,25
e)2.7(3)-1,3-5,65+41/15
f)-1,(2)+2,(2)-3,(1)

Answer 1

a)(-3/10)-(-5/12)-(+7/20)= -3/10 +5/12 -7/20= -18/60+25/60−21/60=-5/60=
= -1/12

b)-3/14+9/28-5/42-1/84= -18/ 84 +27/84 -10/84 -1/84= -2/84= -1/42

c)1/14-(5/28-1/84)=1/14 -(15/84−1/84)= 1/14 -14 /84= 6/84-14/84= -8/84=
= - 2/21

d)1,1(6)-0,5+1,25-0,(6)-2,25=105/90-5/10+125/100-6/9-225/100=
= -50/100+125/100-225/100 +105/90-60/90= -150/100 -60/90=
=-3/2 -2/3= -9/6- 4/6= -13/6

e)2.7(3)-1,3-5,65+41/15=246/90 -13/10-565/100+41/15= 41/15 -13/10-
113/20+41/15=82/15-26/20-113/20= 82/15-139/20=328/60-417/60=
= -89/60

f)-1,(2)+2,(2)-3,(1)= -11/9+20/9-28/9= -19/9