Ответ:
(x+5) - (m-5) = х+5-m+5 = х-m+10
y²+1 - (1+y)² = y²+1-(1+2y+y²)=y²+1-1-2y-y²= -2y
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Ответ:
(x+5) - (m-5) = х+5-m+5 = х-m+10
y²+1 - (1+y)² = y²+1-(1+2y+y²)=y²+1-1-2y-y²= -2y