-10m²-20mn-10n²
-(10m²+20mn+10n²) | :10
-(m²+2mn+n²)
-(m+n)², при m=-20, n=19.8.
-(-20+19.8)²
-(-0.2)² = -0.04
ответ: -0.04
-10m²-20mn-10n²
-(10m²+20mn+10n²) | :10
-(m²+2mn+n²)
-(m+n)², при m=-20, n=19.8.
-(-20+19.8)²
-(-0.2)² = -0.04
ответ: -0.04