упростить выражение:
с-3 с*2-9 1
---- - ------ * ----- =
с с с-3
(c-3)/c-(c^2-9)/c*1/(c-3)=(c-3)/c-(c+3)/c=-6/c
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(c-3)/c-(c^2-9)/c*1/(c-3)=(c-3)/c-(c+3)/c=-6/c