РЕШЕНИЕ:
( a + 4b − _1) : __b__ =
a4−4ab___ a ___ 4b−a
( a + 4b − _1) : __b__ =
a(a-4b)___ a ___ 4b−a
a + 4b − (a-4b) : __b__ =
a(a-4b) __ __ ___ 4b−a
a + 4b − a + 4b : __b__ =
a(a-b) __ __ ___ 4b−a
8b __ : __b__ =
a(a-4b) __ 4b−a
8b __ ∙ a - 4b =
a(a-4b) __ -b
8 =
- a
8 __ = - 80
- 0.1
Ответ: - 80