Răspuns:
b). [(1/3+2/21):(1/18+1/14)-2 1/2]×8=
[(7/21+2/21):(7/126+9/126)-5/2]×8=
[9/21:16/126-5/2]×8=
[1/3:8/63]×8=
[1/3×63/8]×8=
9/8×8=
9
c). (1/12+1/24-1/36)÷(1/4+3/5)×2 3/7=
(6/72+3/72+2/72)÷(5/20+12/20)×17/7=
11/72÷17/20×17/7=
11/72×20/17×17/7=
55/126
d).(3+3/8)÷(4/35-2/70×7/4)×4/15=
(24/8+3/8)÷(4/35-1/20)×4/15=
27/8÷(16/140-7/140)×4/15=
27/8÷9/140×4/15=
27/8×140/9×4/15=
14
