Question

Помогите решить пример Даю 50б

Answer 1

$frac{ a^{2} -16b^{2} }{4ab}:( frac{1}{4b}- frac{1}{a} )= frac{(a-4b)(a+4b)}{4ab} * frac{4ab}{a-4b}=a+4b$

при а=4 9/13, b=6 1/13

4 9/13+4 * 6 1/13=4 9/13 + 4*6+4*1/13=4 9/13+24+4/13=28 13/13=29

Answer 2

(а–4b)(a+4b) a–4b
------------------ : -------- =
4ab 4ab

(а–4b)(a+4b)•4ab
= ------------------------- = a+4b =
4ab•(a–4b)

61 4•79 61+316 377
= ---- + ------- = ---------- = ------ = 29
13 13 13 13