Как решить 36x^4-25x^2+4=0
X^2=t t^2+25t+4=0 корни= 4/9 и 1/2 x^2=4/9 x^2=1/2 x=+- 2/3 x=+- 1/
X²=a 36a-25a+4=0 D=625-576=49 a1=( 25+7 )/36= 32/36=8/9 a2=(25-7)/36=18/36=1/2 x²=8/9 x²=1/2 x=(2√2)/3 x= √2/2 x=-2√2)/3 x=-√2/2