a) (1-½)²-(1-1/3)²=(½)²-(⅔)²=¼-4/9=9/36-16/36=-5/36
b)25*(1/5)²+3*(-2)²
----------------------- = 25*1/25*3*4 = 12
(4-7)⁰
z mianownika wychodzi 1.
c)(7/5)¹ :(-1,4)+ 3³/10*(-1/9)+(2 2/3)²*(1 1/12)¹ = 7/5*(-10/14)+9/10*(-1/9)+64/9*13/12 = -1-0,1+208/27 = -11/10+208/27= -297/270+2080/270=1783/270
