Question

1) сократите дробь: $frac{(ab+ac)^{2} }{ab^{2}-ac^{2} }$
2) упростите выражение: $( frac{1}{c} - frac{1}{10-c} )*( frac{25}{c-5} -c+5)$
СРОЧНО НАДО

Answer 1

1
(ab+ac)²/(ab²-ac²)=a²(b+c)/a(b²-c²)=a(b+c)/(b-c)(b+c)=a/(b-c)
2
1)1/c-1/(10-c)=(10-c-c)/c(10-c)=(10-2c)/c(10-c)=2(5-c)/c(10-c)=2(c-5)/c(c-10)
2)25/(c-5) -(c-5)=(25-c²+10c-25)/(c-5)=(10c-c²)/(c-5)=c(10-c)/(c-5)
3)2(c-5)/c(c-10) * c(10-c)/(c-5)=-2