20а⁴в/25а³в²
2х/х²+4х
_______
1/2а-в-1/2а+в
5/с+3-5с-2/с²+3с
_______________
а²-в/а,если а=0,2 в = -5
_____________________
2/х-4-х+8/х2-16-1/х
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