










1․ ab4 — ba4 / a3 — b3 + 3ab = ab(b3 — a3) / -(b3 — a3) + 3ab = -ab + 3ab = 2ab
(11 + 2√11 — 2√11 — 4) = 2 + 7 = 14
2. √60 — √20 / √5 — √15 = 2√5 — 2√5 / √5 — √15 = 2√15 — 2√5 / — (√15 — √5) = 2(√15 — √5) / — (√15 — √5) = -2

4. lg8 + lg18 / 2lg2 + lg3 = lg144/lg12 = lg122 / lg12 = 2log12 / lg 12 = 2







(3√5-2)3 + 12(√5 — 3) = 45 — 12√5 + 4 + 12√5 — 36 = 13
Պատ․՝ 13

log38 + log310 / 2log32 + 1 = log3144 / log34 + log33 = log3144/log312 = log3122/log312 = 2log312/log312 = 2
Պատ․՝ 2

(a+b)2 — (a-b)2 / 4a2b2 = a2 + 2ab + b2 — (a2 — 2ab + b2) = a2 + 2ab + b2 — a2 + 2ab — b2 =4ab
4ab/4a262 = 1/ab
1 * 40/2 = 20
Պատ․՝ 20

9 — a2/5 / 3 + a1/5 = 32 — (a1/5)2 = (3 — a1/5)(3 + a1/5) = 3 — a1/5 = 3 — 5√32 = 3 — 2 = 1
2(cosπ/8 + sinπ/8)2 = 2(cos2π/8 + sinπ/8cosπ/8 + sin2π/8) = 2cos2π/8 + 4sinπ/8cosπ/8 + 2sin2π/8 = 2sin2π/8 + 2(cos2π/8 + sin2π/8) = √2 + 2
sinπ * cosπ/5 + 4cosπ/3 * sin5π/2 = 2 * sin5π = 1
cos42osin48o + sin42ocos48o = sin(42 + 48) = sin90o = 0

(3√5-2)3 + 12(√5 — 3) = 45 — 12√5 + 4 + 12√5 — 36 = 13
Պատ․՝ 13

log38 + log310 / 2log32 + 1 = log3144 / log34 + log33 = log3144/log312 = log3122/log312 = 2log312/log312 = 2
Պատ․՝ 2

(a+b)2 — (a-b)2 / 4a2b2 = a2 + 2ab + b2 — (a2 — 2ab + b2) = a2 + 2ab + b2 — a2 + 2ab — b2 =4ab
4ab/4a262 = 1/ab
1 * 40/2 = 20
Պատ․՝ 20

9 — a2/5 / 3 + a1/5 = 32 — (a1/5)2 = (3 — a1/5)(3 + a1/5) = 3 — a1/5 = 3 — 5√32 = 3 — 2 = 1

1․ ab4 — ba4 / a3 — b3 + 3ab = ab(b3 — a3) / -(b3 — a3) + 3ab = -ab + 3ab = 2ab
(11 + 2√11 — 2√11 — 4) = 2 + 7 = 14
2. √60 — √20 / √5 — √15 = 2√5 — 2√5 / √5 — √15 = 2√15 — 2√5 / — (√15 — √5) = 2(√15 — √5) / — (√15 — √5) = -2

4. lg8 + lg18 / 2lg2 + lg3 = lg144/lg12 = lg122 / lg12 = 2lg12 / lg 12 = 2
