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Oblicz w pamięci :   -12 + ( -11) = -50+ 25 = -101 + ( -120 ) = -7+42 = -101 + 84 = -106 + 120= -16 + 3 = 99 + ( -19 ) -27 + 31 =   Oblicz sprytnie : ( -1) + (-2)+(-3)+(-4)+(-5)+(-6)+(-7)+(-8)+(-9)+(-10) =

Oblicz w pamięci :   -12 + ( -11) = -50+ 25 = -101 + ( -120 ) = -7+42 = -101 + 84 = -106 + 120= -16 + 3 = 99 + ( -19 ) -27 + 31 =   Oblicz sprytnie : ( -1) + (-2)+(-3)+(-4)+(-5)+(-6)+(-7)+(-8)+(-9)+(-10) =
Odpowiedź

-12 + ( -11) = -23 -50+ 25 = - 25 -101 + ( -120 ) = - 221 -7+42 = 35 -101 + 84 = -17 -106 + 120= 14 -16 + 3 = -13 99 + ( -19 ) = 80 -27 + 31 = 4   Oblicz sprytnie :   ( -1) + (-2)+(-3)+(-4)+(-5)+(-6)+(-7)+(-8)+(-9)+(-10) = - 55

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