Question

V.2. Operații cu numere raționale 1 Calculați: (-4/7)+(-2/21)+(+11/12)+(-9/14)=
(+1/48)+(-3/16)+(+5/24)=
(+5/6)+(+7/12)+(-2/3)+(-1/4)=
Ma poate ajuta cineva? ​

Answer 1

a) (-4/7)+(-2/21)+(+11/12)+(-9/14)=

-⁶4/7-²2/21+11/12-³9/14=

(-24-4-27)/42+11/12=

²-55/42+711/12=(-110+77)/84=-33/84=

-11/42

b)(+1/48)+(-3/16)+(+5/24)=

1/48-³3/16+²5/24=(1-9+10)/48=

2/48=1/24

c)(+5/6)+(+7/12)+(-2/3)+(-1/4)=

²5/6+7/12-⁴2/3-³1/4=

(10+7-8-3)/12=6/12=1/2