Ab-b(^)2= b(a-b)
2) 3a(^)2b(2a-5b)
(b+1)/(b+3)+(b+3)/(b-1)=(4-8b)/(b+3)(b-1)
(b+1)(b-1)+(b+3)(b+3)=4-8b
b²-1+b²+6b+9-4+8b=0
2b²+14b+4=0
b²+7b+2=0
D=49-8=41
b1=(-7-√41)/2
x2=(-7+√41)/2
1.
(х+3)/3=(2х+10)/(х-3)
(х+3)(х-3)=3(2х+10)
х² - 9-6х-30=0
х² -6х-39=0
D/4=3²+39=48=+-(16√3)²
х1=3+16√3≈30,7
х2=3-16√3≈ - 24,7