Пожалуйста помогите
1) [tex] \frac{3a+6b}{a-1} * \frac{a-1}{a+2b} [/tex]
2) [tex] \frac{x+y}{x-y} : \frac{y-2}{4x-4y} [/tex]
3) [tex] \frac{ a^{2} -ab }{c+1} : \frac{2a-2b}{c+1} [/tex]
4) [tex] \frac{5n-5m}{3(a+1)} * \frac{ 2a^{2}+a }{ (n-m) ^{2} } [/tex]

13(3(a+2b)/(n-1)*(n-1)/(a+2b)=32(x+y)/(x-y)*4(x-y)/(y-2)=4(x=y)/(y-2)3a(a-b)/(c+1)*(c+1)/2(a-b)=a/245(n-m)/3(a+1)*2a(2a+1)/(n-m)²=10a(2a+1)/3(a+1)(n-m)