phương trình bậc 2 một ẩn!!!!!!!

R

rooney_cool

N

nhongocxit_9x

ta có [TEX]:(\frac{x_1}{x_2})^4 +(\frac{x_2}{x_1})^4 =2 [/TEX] [TEX]\Leftrightarrow( x_1 + x_2 )^4 - 4(x_1 +x_2 ) ^2. x_1 x_2 + 2(x_1 .x_2 )^2= 2(x_1 x_2 )^4=> (-2m )^4 - 4 . (- 2m) ^2 . 4 + 2 .16 = 2 . 256[/TEX] => [TEX]16 m^4 - 64 m^2 + 32 = 512 [/TEX]
=> [TEX]m ^4 - 4 m^2 - 30 =0 => m[/TEX]:p:p:p:p:p:p:p
 
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