Объяснение:
9n²-16m²+40m-25=9n²-(16m²-40m+25)= 9n²-(16m²-2*4m*5+5²)=
=9n²-(4m-5)²=(3n-(4m-5))(3n+4m-5)=(3n-4m+5)(3n+4m-5)
Объяснение:
9n²-16m²+40m-25=9n²-(16m²-40m+25)= 9n²-(16m²-2*4m*5+5²)=
=9n²-(4m-5)²=(3n-(4m-5))(3n+4m-5)=(3n-4m+5)(3n+4m-5)