1 + 2 + 3 + ......... + 256 - 372 - 129 = 32 395
= 256 × ( 1 + 256 ) : 2 - 372 - 129 =
= 128 × 257 - 372 - 129 =
= 32 896 - 372 - 129 =
= 32 524 - 129 =
= 32 395
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Calculez mai intai suma, aplicand formula sumei lui Gauss; apoi scad numerele date.