решил только а) <span> (5х+2)(х-1):5-(3х-5)(х+2):3=2</span>
<span>(3(5х+2)(х-1)-5(3х-5)(х+2))/15=2</span>
<span>3(5x^2-5x+2x-2)-5(3x^2+6x-5x-10=30</span>
<span>15x^2-15x+6x-6-15x^2-30x+25x-50=30</span>
<span>-14x=-14</span>
<span>x=1</span>
Ответ: В
Объяснение: f = (-3) = -3^3= -27
1) Решение:<span>8x−6<<span>x2</span>−3⇒</span><span>8x−6−<span>x2</span>+3<0⇒</span><span>−<span>x2</span>+8x−3<0</span><span>Решим квадратное уравнение </span><span>−<span>x2</span>+8x−3=0
</span>Корни квадратного уравнения:<span><span>x1</span>=4−√13;<span>x2</span>=4+<span>√13
</span></span>Ответ:<span>x∈<span>(<span>−∞;4−√13</span>)</span>∪<span>(<span>4+√13;+∞</span>)</span></span>или<span>x<4−√13;x>4+<span>√13
</span></span>2) 3<span><span>x2</span>−4>2<span>x2</span>+5⇒</span><span>3<span>x2</span>−4−2<span>x2</span>−5>0⇒</span><span><span>x2</span>−9>0</span><span>Решим квадратное уравнение </span><span><span>x2</span>−9=0
</span>Корни квадратного уравнения:<span><span>x1</span>=−3;<span>x2</span>=3
</span>Ответ:<span>x∈<span>(<span>−∞;−3</span>)</span>∪<span>(<span>3;+∞</span>)</span></span>или<span><span>x<−3;x>3</span></span>