Question

Помогите пожалуйста

Answer 1

1a) 

$=cfrac{3c-a-a+7c}{4c}=cfrac{10c-2a}{4c}=cfrac{5c-a}{2c}$

1б)

$=cfrac{2p+(3-p)}{p+3}=cfrac{p+3}{p+3}=1$

1в)

$=cfrac{x^2}{x-4}-cfrac{4x}{x-4}=cfrac{xcdot (x-4)}{x-4}=x$

1г)

$=cfrac{m-n}{m^2-n^2}=cfrac{m-n}{(m-n)cdot (m+n)} = cfrac{1}{m+n}$

2)

$=cfrac{60+y+15y+4+y^2}{(y+8)^2}=cfrac{y^2+16y+64}{(y+8)cdot(y+8)}=cfrac{y^2+16y+64}{y^2+8y+8y+64}= \ =cfrac{y^2+16y+64}{y^2+16y+64}=1$