(⁹√7)⁹- ³√√64+³√250/ ³√2 =7 - ⁶√2⁶ +³√(250/2)= 7-2+5=10
³√(0,125⁻¹)+⁴√81³-⁴√(1/16)⁻⁵ = ³√((0,5)³)⁻¹)+⁴√((3⁴)³ -⁴√(1/2)⁴)⁻⁵ =
= (1/0,5) + 3³ -2⁵ = 2+27- 32 = -3
(⁵√√2²*3⁴)⁵ √2²*3⁴ 2*3² 3
---------------- = --------------- = ---------- = --------- = 1,5
⁴√√2¹⁶*3⁸ ⁸√2¹⁶*3⁸ 2²*3 2
80:(2+3+4+5+6)=4см __ 1 часть
4*2=8 см
Ответ:8см
Tg³2x-tg2x=0;⇒tg2x=z;
z³-z=0;
z·(z²-1)=0;
z=0;⇒tg2x=0;2x=kπ;k∈Z;x=kπ/2;k∈Z;
z²=1;⇒z=⁺₋1;
z=1;⇒tg2x=1;⇒
2x=π/4+kπ;k∈Z;⇒
x=π/8+kπ/2;k∈Z;
z=-1;⇒tg2x=-1;⇒
2x=-π/4+kπ;k∈Z;⇒
x=-π/8+kπ/2;k∈Z;
2/a - (- 3a² - 10b²) / ab - 3a/b =
= (2b + 3a² + 10b² - 3a²) / (ab) = (2b + 10b²) / (ab) =
= (2b + 10b²) / (ab) = 2b(1 + 5b) / (ab) = 2(1 + 5b) / a
-5х+8х-3=0,
3х - 3 = 0,
3х = 3,
х = 1.