Пошаговое объяснение:
2) (8-b)(8+b)
4) (1,7-d)(1,7+d)
6)(10/11-y)(10/11+y)
8) (t - 20/21)(t+20/21)
10)-(16-49y^2)= -(4-7y)(4+7y)
12) (8/9t-6)(8/9t+6)
14)(5/8b-9/1)(5/8b+9/1)
Пошаговое объяснение:
2) (8-b)(8+b)
4) (1,7-d)(1,7+d)
6)(10/11-y)(10/11+y)
8) (t - 20/21)(t+20/21)
10)-(16-49y^2)= -(4-7y)(4+7y)
12) (8/9t-6)(8/9t+6)
14)(5/8b-9/1)(5/8b+9/1)