Oblicz sprytnie :
( -1 ) + ( -2 ) + ( -3 ) + ( -4 ) + (-5 ) + ( -6 ) + ( -7 ) + (-7 ) + ( -8 ) + (-9 ) + ( -10 ) =
Z góry DZIĘKI : )
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( -1 ) + ( -2 ) + ( -3 ) + ( -4 ) + (-5 ) + ( -6 ) + ( -7 ) + (-7 ) + ( -8 ) + (-9 ) + ( -10 ) =
= -1 -2 -3 -4 -5 -6 -7 -7 -8 -9 -10= -62
Plusy i minusy dają razem minus :P
( -1 ) + ( -2 ) + ( -3 ) + ( -4 ) + (-5 ) + ( -6 ) + ( -7 ) + (-7 ) +(-7) ( -8 ) + (-9 ) + ( -10 ) =(-1)- 2- 3- 4- 5- 6- 7-7- 8- 9- 10=( - 10 )- 5- 6- 7-7- 8 - 9 - 10 =( -21 ) - 7 - 7 - 8 - 9 - 10 = -62
Proszę :)