(M-1/M^2+6M+9)+(M-3/M^2+4M+3)怎么化简
问题描述:
(M-1/M^2+6M+9)+(M-3/M^2+4M+3)怎么化简
答
(M-1/M^2+6M+9)+(M-3/M^2+4M+3)
=(m-1)/(m+3)²+(m-3)/(m+3)(m+1)
={(m-1)(m+1)+(m-3)(m+3)}/(m+3)²(m+1)
=(m²-1+m²-9)/(m+3)²(m+1)
=2(m²-5)/(m+3)²(m+1)