Question

Помогите с дз пж!!!!!

Answer 1

1)c ^{2} -2 cm+m^{2}=  (c-m)^{2}  
2)9+6c+c^{2} = (3+c)^{2} 
3)81 c^{2} -36cm+  4m^{2}= (9-2m)^{2}
4)25c^{2}+10mc+m^{4}=(5+m^{2} )^{2}    

2.
$frac{ 29^{2}+2 * 29*21 +21^{2} }{26^{2}- 24^{2} }= frac{(29+21)^{2} }{(26-24)(26+24)} = frac{50^{2} }{2*50}= frac{2500}{100} =25$