Log3 1/27 - log4 32 = log3 (3^-3) - log2^2 (32^5) = -3*log3 (3) - 5/2*log2 (2) = -3 - (5/2) = -(11/2) = -5,5
1) (y-4)^2=y^2-8y+16;
2) (5c-1)(5c+1)=25c^2-1;
3) (7x+a)^2=49x^2+14ax+a^2;
4) (3a+2b)(3a-2b)=9a^2-4b^2.
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x\sqrt{x}-\frac{27}{\sqrt{x}+3}=\frac{x^2+3x\sqrt{x}-27}{\sqrt{x}+3}
Объединение двух прямых y=x и у=-х