Răspunsuri

2014-05-04T01:21:18+03:00
A)⇒ x²-4+x²-9+x²-16+x²-25⇒4x²+54   =2(2x²+27)
b)=a²-9+a-6a+9=a²-5a=a(a-5)
c)=m²+10m+25-m²+25=10m+50=10(m+5)