[latex] frac{1}{27}m^4+ frac{26}{27}m^2-1=0; ; |*27\\m^4+26m^2-27=0\a=m^2\a^2+a-27=0\ left { {{a_1*a_2=-27} atop {a_1+a_2=-26}} ight. = extgreater left { {{a_1=1} atop {a_2=-27}} ight. \\m^2=1\m_{1,2}=б1\\m^2 eq -27; ; ; (m^2 geq 0) [/latex]Ответ: -1; 1