giải phương trình 10

V

vipboycodon

$PT \leftrightarrow t^4 = 10t^2-t-20$

$\leftrightarrow 4t^4 = 40t^2-4t-80$

$\leftrightarrow 4t^4-36t^2+81 = 4t^2-4t+1$

$\leftrightarrow (2t^2-9)^2 = (2t-1)^2$
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