-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
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-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