Question

3.Calculati
a) (-2/5)+(-3/10)+(+1/2)+(+4/15)
b) (-5/3)+(-5/6)+(+5/2)+(-5/12)
c) (+7/18)+(-3/2)+(-11/9)+(+4/1)
d) (-2/21)+(-3/7)+(+5/42)+(-9/14)
e)(-7/11)+(-1/4)+(+1/2)+(-5/22)
f)2/7+(-1/14)+(+5/6)+(-13/42)​

Answer 1

Răspuns:

Explicație pas cu pas:

a) (-2/5)+(-3/10)+(+1/2)+(+4/15)=

=-2/5 -3/10 +1/2 + 4/15=

=-2/5 -3/10 +1/2 + 4/15=

=(-12-9+15+8)/30=2/30=1/15

b) (-5/3)+(-5/6)+(+5/2)+(-5/12)=

= -5/3 -5/6 + 5/2 - 5/12 =

= (-20 - 10 + 30 - 5)/12 =

= - 5/12

c) (+7/18)+(-3/2)+(-11/9)+(+4/1)=

= +7/18 - 3/2 - 11/9 + 4/1 =

=( +7 - 27 - 22 + 72)/18 =

=30/18 = 5/3

d) (-2/21)+(-3/7)+(+5/42)+(-9/14)=

= -2/21 -3/7 +5/42 - 9/14=

=( -4 -18 +5- 27)/42=

=-44/42= - 22/21

e)(-7/11)+(-1/4)+(+1/2)+(-5/22)=

=-7/11 -1/4 + 1/2 -5/22=

=(-28 -11 + 22 -10)44=

=-27/44

f) 2/7+(-1/14)+(+5/6)+(-13/42)​=

=2/7 -1/14 + 5/6 - 13/42​=

=(12 -3 + 35 - 13)/42​=

=31/42

Answer 2

Explicație pas cu pas:

gata .cu placere o zi frumoasa