Б) (а² -а+1)(а+1)= a³+1³= a³+1 В) (9m³ -5 p²n)² = (9m³-5np²)²=81m⁶-90m³np²+25n²p⁴ Г) (7n-6m) * (7n + 6m) = (7n)²-(6m)²=49n²-(6m)²=49n²-36m² Д) (2+m)(2 - m)(m² + 4)=(4 - m² )(4 + m² ) (4-m²)(m²+4)=(4-m²)(4+m²) (4-m²)(4+m²)=(4-m²)(4+m²) (4-m²)(4+m²)=16-m⁴ 16-m⁴=16-m⁴ m Є R E) (a+3)²-(a+2)²=(a+3-а-2)(a+3+a+2) (a+3)²-(a+2)²=(3-2)(a+3+a+2) a²+6a+9-(a+2)²=(3-2)(a+3+a+2)
a²+6a+9-(a²+4a+4)=(3-2)(a+3+a+2) a²+6a+9-(a²+4a+4)=1(a+3+a+2) a²+6a+9-(a²+4a+4)=a+3+a+2 a²+6a+9-a²-4a-4=a+3+a+2 a²+6a+9-a²-4a-4=2a+3+2 a²+6a+9-a²-4a-4=2a+5 6a+9-4a-4=2a+5 2a+9-4=2a+5 2a+5=2a+5 a Є R
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Ответ:
Б) (а² -а+1)(а+1)= a³+1³= a³+1
В) (9m³ -5 p²n)² = (9m³-5np²)²=81m⁶-90m³np²+25n²p⁴
Г) (7n-6m) * (7n + 6m) = (7n)²-(6m)²=49n²-(6m)²=49n²-36m²
Д) (2+m)(2 - m)(m² + 4)=(4 - m² )(4 + m² )
(4-m²)(m²+4)=(4-m²)(4+m²)
(4-m²)(4+m²)=(4-m²)(4+m²)
(4-m²)(4+m²)=16-m⁴
16-m⁴=16-m⁴
m Є R
E) (a+3)²-(a+2)²=(a+3-а-2)(a+3+a+2)
(a+3)²-(a+2)²=(3-2)(a+3+a+2)
a²+6a+9-(a+2)²=(3-2)(a+3+a+2)
a²+6a+9-(a²+4a+4)=(3-2)(a+3+a+2)
a²+6a+9-(a²+4a+4)=1(a+3+a+2)
a²+6a+9-(a²+4a+4)=a+3+a+2
a²+6a+9-a²-4a-4=a+3+a+2
a²+6a+9-a²-4a-4=2a+3+2
a²+6a+9-a²-4a-4=2a+5
6a+9-4a-4=2a+5
2a+9-4=2a+5
2a+5=2a+5
a Є R