Question

Completati spatiile punctate
A) 2/3-1/7=
B)-11/4-3/2+17/3=
C)6/11-23/22+5/2=
Calculati
A)1/2-1/4+5/6-3/8=
B)25,3+0,7-21,(83)-16/99=
D)2,71-0,8(2)+1,2(5)+1 3/5-0,65(4)=
Inmultirea numerelor rationale are urmatoarele proproetati:
A)
B)
C)
D)
E) este distributiva fata de adunare si de scadere adica

Answer 1

a)2/3-1/7=(14-3)/21=11/21
b)-11/4-3/2+17/3=(-33-18+68)/12=17/12
c)6/11-23/22+5/2=(12-23+55)/22=44/22=2

a)1/2-1/4+5/6-3/8=(12-6+20-9)/24=17/24
b)253/10+7/10-21 intregi 83/99-16/99=
260/10-2162/99-16/99=
26-2178/99=
(2574-2178)/99=396/99=44/11=4
d)271/100-(82-8)/90+1 intreg (25-2)/90-(654-65)/900=
271/100-37/45+113/90-589/900=
(2439-740+1130-589)/900=2240/900=112/45