Oblicz:
(63/7-55/7x1,8)-1=
(1:(1/2+1/6))-1
(63/7-55/7x1,8)-1 = (8/7 x 1,8) -1 = (1 1/7x1 8/10) - 1 = (8/7 x 18/10) - 1 = (4/7 x 18/5) - 1 = 72/35 - 1 = 2 2/35 - 1 = 1 2/35
(8/7 x 1 4/5)-1 = (8/7x9/5)-1= 72/35 -1 = 2 2/35 - 1 = 1 2/35
(1: (1/2 + 1/6))-1= (1 : (3/6+1/6))-1 = (1 : 4/6)-1 = (1: 2/3 )-1 = 3/2 - 1 = 1/2 =0,5
[(81 1/2 - 1,5): (1/3)^{-1} : 4 1/6]^{-2} += [80 : (- 1/3) : 25/6]^{-2} =
= [80 : (- 1/3) x 6/25 ]^{-2} =[ 80 : (- 1/5)]^{-2} = [-16]^{-2} = 256
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(63/7-55/7x1,8)-1 = (8/7 x 1,8) -1 = (1 1/7x1 8/10) - 1 = (8/7 x 18/10) - 1 = (4/7 x 18/5) - 1 = 72/35 - 1 = 2 2/35 - 1 = 1 2/35
(8/7 x 1 4/5)-1 = (8/7x9/5)-1= 72/35 -1 = 2 2/35 - 1 = 1 2/35
(1: (1/2 + 1/6))-1= (1 : (3/6+1/6))-1 = (1 : 4/6)-1 = (1: 2/3 )-1 = 3/2 - 1 = 1/2 =0,5
[(81 1/2 - 1,5): (1/3)^{-1} : 4 1/6]^{-2} += [80 : (- 1/3) : 25/6]^{-2} =
= [80 : (- 1/3) x 6/25 ]^{-2} =[ 80 : (- 1/5)]^{-2} = [-16]^{-2} = 256