Question

Решите пожалуйста номер 13

Answer 1

№13
1) (a-x)(a+x)(a²+x²)=(a²-x²)(a²+x²)=(a²)² - (x²)²=a⁴-x⁴

2) (x+1)(x-1)(x²+1)=(x²-1)(x²+1)=(x²)² - 1²=x⁴-1

3) (a+(b+c))(a-(b+c))=a²-(b+c)²=a²-(b²+2bc+c²)=a²-b²-c²-2bc

4) (2-(x+y))(2+(x+y))=2² - (x+y)²=4-(x²+2xy+y²)=4-x²-2xy-y²