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105 - 7 - 13 + 20 = 105 - 20 + 20 = 105
b] -16 + 67 + (-10) + (-7) + 66=
-16 + 67 - 10 - 7 + 66 = - 33 + 133 = 100
c] 2 i dwie piąte + (-4,1) + 7 i trzy piąte + (-5,9) =
2 i 2/5 - 4 i 1/10 + 7 i 3/5 - 5 i 9/10 = 2 i 4/10 - 4 i 1/10 + 7 i 6/10 - 5 i 9/10 = 2,4 - 4,1 + 7,6 - 5,9 = 10 - 10 = 0
b] -16 + 67 + (-10) + (-7) + 66= 51 +(-10) +(-7)+ 66 = 41 + (-7) + 66 = 34 + 66 = 100
c] 2 i dwie piąte + (-4,1) + 7 i trzy piąte + (-5,9) = 2,4 - 4,1 + 7,6 - 5,9 = -1,7 +7,6 - 5,9 = 5,9- 5,9 = 0
b) 100
c) 0