<prompt> Rahisisha 2-2i55i, ambapo i2 -1.  <response>: Ili kurahisisha bidhaa ya nambari changamano, ninaweza kutumia kipengele cha usambazaji na kuchanganya maneno kama hayo. Ninapata 2-2i55i 255i - 2i55i 10 10i - 10i - 10i2. Sasa ninaweza kurahisisha masharti yanayohusisha i2 kwa kubadilisha -1 kwa i2. napata 10 10i - 10i - 10i2 10 10i - 10i 10 20. 