3 do potęgi drugiej * [(280 - 190) : 9 + 20 * 2] =
3^2 * [(280 - 190) : 9 + 20 * 2] =
= 9 * [ 90:9 + 40 ] =
= 9* [ 10 + 40 ]=
= 9* 50 =
= 450
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3^2 * [(280 - 190) : 9 + 20 * 2] =
= 9 * [ 90:9 + 40 ] =
= 9* [ 10 + 40 ]=
= 9* 50 =
= 450