oblicz wartość wyrażenia arytmetycznego a) 27,5 - ( dwie trzecie - 1,8 * pięć szóstych) : (- jedna druga)
27,5 - (2/3 - 1,8 * 5/6) : (-1/2) =
=27,5 - (2/3 - 9/5 * 5/6) * (-2) =
=27,5 - (2/3 - 3/2) * (-2) =
= 27,5 - (4/6 - 9/6) *(-2) =
=27,5 - (-5/6) * (-2) =
= 27,5 - 5/3 =
= 27 3/6 - 1 4/6 =
= 26 9/6 - 1 4/6 =
=25 5/6
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27,5 - (2/3 - 1,8 * 5/6) : (-1/2) =
=27,5 - (2/3 - 9/5 * 5/6) * (-2) =
=27,5 - (2/3 - 3/2) * (-2) =
= 27,5 - (4/6 - 9/6) *(-2) =
=27,5 - (-5/6) * (-2) =
= 27,5 - 5/3 =
= 27 3/6 - 1 4/6 =
= 26 9/6 - 1 4/6 =
=25 5/6