Question

Вычислите:
д) (√7 + √8)(√7 - √8);
е) (2√7 + 7√2)(2√7 - 7√2)

Answer 1

7-8
28-98
.....................

Answer 2

д)    =(√7)²-(√8)² =7-8=-1

е)= (2√7)² -(7√2)²=28-98=-70