dam naj Pilne błagam o pomoc

Zad 4 a). 3 - 3/4 = 2 i 4/4 - 3/4 = 2 i 1/4 b). -5 i 3/4 +2 i 2/3 = -5 i 9/12 +2 i 8/12 = -3 i 1/12 c).4 i 1/2 :(0,5 - 1/8) = 9/2 :(1/2 - 1/8) = 9/2 :(4/8 - 1/8) = 9/2 : 3/8 =    =9/2 · 8/3 = 12 d).((-1/4)²+0,3 · 5/6) :(-3) = (1/16 +3/10 · 5/6) :(-3) = (1/16 +1/4) :(-3)=    = (1/16 +4/16) :(-3) = 5/16 · (-1/3) = -5/48 Zad 5 a).-3,45 ·8 = -27,6 b).(-1,4)³ = (-1 i 2/5)³ = (-7/5)³ = -343/125 = -2 i 93/125 c).-0,3 ·(-1/3)² = -3/10 · 1/9 = -1/30 d).-5,6:(-0,8) = 7 Zad 6 a).5,65 -(-1 i 1/3) = 5 i 13/20 +1 i 1/3 = 5 i 39/60 +1 i 20/60 = 6 i 59/60 b).-4 i 3/4 - 2,2 = -4 i 3/4 - 2 i 1/5 = -4 i 15/20 - 2 i 4/20 = -6 i 19/20 c).-5 i 5/7 +2,6 = -5 i 5/7 +2 i 3/5 = -5 i 25/35 +2 i 21/35 = -3 i 4/35 Zad 7 -(3 - 2/3) : (-1/3 +3) = -(2 i 3/3 - 2/3) : (-1/3 +2 i 3/3) = -2 i 1/3 : 2 i 2/3 = = -7/3 : 8/3 = -7/3 · 3/8 = -7/8