1. 1) (3b(2-b)+b-3)/3b²=
=(6b-3b²+b-3)/3b²=
=(7b-3b²+3)/3b²
2) (3(c+3))*2c^4)/
/6c(c+3)=6c^4/6c=c^3
3) (x-y)(x+y)*1)/6y(x-y)²=
=(x+y)/6y(x-y)
2. 1) (a*(4-a)(4+a))/a²*(4-a)= =(4+a)/a
2) (5/a)-(4+a)/a=(5-4-a)/a=
=(1-a)/a
3. 1) (x+7y)² *-3(x-7y))/
/(x-7y)(x+7y)=(-3(x+7y)
2) (-3(x+7y)/7x(x+7y)=
=(-3/7x)=(-3/7*9)=(-3/63)=
= -1/21