не контрольная!
1) b^(1/3)/29b^2 =1/ 29*b^(5/3)
2) <span> log₃ (9а) если log₃ а = 0,3</span>
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<span> log3 (9a) = log 3 9 + log 3 a = 2+ log 3 a = 2+0.3=2.3 </span>
3) <span>⁵√0,016 · ⁵√-0,02 = (0.016*-0.02)^(1/5) = ( -0.00032)^( 1/5 ) = -0.2</span>
<span>4) вы правильно написали</span>
<span>5) (2x + 14)/(x+4)(x-7) >=0</span>
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<span> 2(x+7)/(x+4)(x-7) >=0</span>
<span> { x+7 >=0</span>
<span> { (x+4)(x-7) >0</span>
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<span> x >= -7</span>
<span> x>-4</span>
<span> x>7 </span>
<span> [-7;-4) U (7;oo)</span>
<span>6) x-√2x^2-9x+5 = 3</span>
<span> √2x^2-9x+5 = x-3</span>
<span> 2x^2-9x+5 = (x-3)^2</span>
<span> 2x^2-9x+5=x^2-6x+9</span>
<span> x^2- 3x -4 = 0 </span>
<span> D=9 +4* 1 *4 = 5^2</span>
<span> x=3+5/2=4</span>
<span> x2=3-5/2=-1 </span>
<span> Подходит только 4 </span>
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