<prompt> Rahisisha displaystylefrac1-i23i, ambapo i2 -1.  <response>: Kuzidisha nambari na kipunguzo kwa konishi ya kipunguzo, tuna anzaalignfrac1-i23i cdot frac2-3i2-3i frac12 1-3i - i2 - i- 3i22 2-3i 3i2 -3i3i frac-1-5i13 -frac113 - frac513i.mwishopanga 