Ответ:
-42,3
Объяснение:
3×2,7b+(-3×2)-3,9, b=-4. Значит, 3×(2,7×(-4))-6-3,9 = -42,3
A) sin(x - π/6) > 0
arcsin0 + 2πn < x - π/6 < π - arcsin0 + 2πn, n∈Z
2πn < x - π/6 < π + 2πn, n∈Z
π/6 + 2πn < x < π + π/6 + 2πn, n∈Z
π/6 + 2πn < x < 7π/6 + 2πn, n∈Z
<span>б) tgx(x - </span>π/4) ≤ 0
- π/2 + πn ≤ x - π/4 ≤ arctg0 + πn, n∈Z
- π/2 + π/4 + πn ≤ x ≤ π/4 + πn, n∈Z
- π/4 + πn ≤ x ≤ π/4 + πn, n∈Z
(2 - x)*(5 - x) = 0
2 - x = 0 или 5 - x = 0
x = 2 или x = 5
Ответ: 2; 5.
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