simplify
(s-r)/(r-s)
and
(r-s)/(s-r)
please show steps
1) note that (s-r) = (-1)(r-s) so you then have (-1)(r-s)/(r-s). The (r-s) cancel and you're left with -1.
2) same method for number 2
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Verified answer
1) note that (s-r) = (-1)(r-s) so you then have (-1)(r-s)/(r-s). The (r-s) cancel and you're left with -1.
2) same method for number 2