Question

1) 2/3×(2 5/6+ 1,75)=
2) 1 2/3÷ (5,5×2 2/11-3 2/3)=
3) 8 1/2- 1,75-(1 3/4+1 2/3)=
4) 48,6÷ 0,54 × 1/3+ 2/3=
a) 4,37÷1000
b)0,0128×100
DAM NAJ I Z OBLICZENIAMI PROSZE!!!

Answer 1

1) 2/3×(2 5/6+ 1,75) = 2/3(17/6 + 7/4) = 2/3[(34+21)/12 ] = 2/3[55/12] = 55/18 =
    = 3 1/18
2) 1 2/3÷ (5,5×2 2/11-3 2/3) = 5/3 : (11/5 ×24/11 - 11/3) = 5/3 : (24/5 - 11/3) =
   = 5/3 : [(72 - 55)/15] = 5/3 : (17/15) = 5/3 × 15/17 = 25/17 = 1 8/17
3) 8 1/2- 1,75-(1 3/4+1 2/3) = 8,5 - 1,75 - (1,75 +1 2/3) = 8,5 - 1,75 - 1,75 - 1 2/3 =
     =  8,5 - 3,5 - 1 2/3 = 5 - 1 2/3 = 3 1/3
4) 48,6÷ 0,54 × 1/3+ 2/3 = 90/3 + 2/3 = 30 2/3
a) 4,37÷1000 = 0,00437
b) 0,0128×100 = 1,28