1. 1. ab4 — ba4 / a3 — b3 + 3ab a = √11 — 2, b = √11 + 2
ab(b3 — a3)/a3 — b3 + 3ab = -ab(a3 — b3)/a3 — b3 + 3ab = -ab + 3ab = 2ab = 2(√11 — 2)(√11 + 2) = 2((√11)2 -22) = 2 * (11 — 4) = 22 — 8 = 14
Պատ.՝ 4) 14
2. 1. 4a2 — 1 / 2a + 1 * a + 1 / 2a2 — a a = 0,1
(2a — 1)(2a + 1)/ 2a + 1 * a + 1/a(2a — 1) = (2a — 1) * a + 1 / a(2a — 1) = a + 1 / a = 0,1 + 1 / 0,1 = 11
Պատ.՝ 2) 11
3. 1. (a + b)2 — (a — b)2 / 4a2b2 a = 2/5; b = 1/8a2 + 2ab + b2 — a2 + 2ab — b2 / 4a2b2 = 4ab/4a2b2 = 4ab/ab(4ab) = 1/ab = 1 / 2/5 * 1/8 = 1/0,05 = 20
Պատ.՝ 1) 20
4. 1. a3 + 5a2 / ab : a + 5/b2 a = √7,3 — √2,3; b = √7,3 + √2,3
a2(a + 5) / ab : a + 5 / b2 = a2(a + 5)/ab * b2 / a + 5 = a2 * b2 / ab = ab(ab)/ab = ab = (√7,3 — √2,3) * (√7,3 + √2,3) = (√7,3)2 — (√2,3)2 = 7,3 — 2,3 = 5
Պատ.՝ 4/5
5. 1. a2 — 5ab / a2b * b2 / a — 5b a = 9/7; b = 18
a(a — 5b)/a2b * b2 / a — 5b = a/a2b * b2 = ab2/a2b = b(ab)/a(ab) = b/a = 18 / 9/7 = 18/1 : 9/7 = 18/1 * 7/9 = 2 * 7 = 14
Պատ.՝ 2) 14
6. 1. a2 — 4a + 4 / 2 — a — (a — 3)2 / 3 — a = (a — 2)2 / 2 — a — (a — 3)2 / 3 — a = (-a + 2)2/2 — a — (-a + 3)2 / 3 — a = (-a + 2) — (-a + 3) = -a + 2 + a — 3 = -1
Պատ.՝ 3) -1