Question

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

Answer 1

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