<em>6-х-х²≥0, х²+х-6≤0, (х+3)(х-2)≤0 Решим методом интервалов.</em>
<em>______-3_______2_________</em>
<em>+ - +</em>
<em>х∈[-3;2] </em>
А1 - 4
А2 - 1
А3 - 1 или 2
В1 - 64
С1 - 1 4/5 a^4 b^4 c^7
C2 - y = x^2 -2
y = -x
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<span>63x-84y²+98ay=</span> -7 *(12*y^2- 14*a*y- 9*x)
Cos(34pi/3)=cos(11pi+pi/3)=-cos(pi/3)=-1/2
cos(pi+a)=-cosa
cos(2pi+a)=cosa