ile to jest 1990345 + 4000 + 70 x 202 : 2
2+2+2+2+2 +(100 x 20) -172
i jeszcze oblicz sprytnie od 1 do 100 czyli 1+ 2+3+4 itd (ale sprytnie ma byc)
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1990345 + 4000 + 70 x 202 : 2=1994345+7070= 1997415
10+2000-172=1838
ostatnie to 5050