Toán Lớp 8: 5x^2-10100x=x-2020. tính gtri của x

Question

Toán Lớp 8:  5x^2-10100x=x-2020. tính gtri của x

mocmien87 · Answer

$  $    Giải đáp + giải th&iacute;ch c&aacute;c bước giải :    $5x^2 - 10100x =x-2020  &hArr;5x^2-10100x -x+2020=0  &hArr; (5x^2 - 10100x)-(x-2020)=0  &hArr;5x(x-2020)-(x-2020)=0  &hArr;(x-2020)(5x-1)=0  &hArr; left[  begin{array}{l}x-2020=0  5x-1=0 end{array}  right.  &hArr; left[  begin{array}{l}x=2020  5x=1 end{array}  right.  &hArr; left[  begin{array}{l}x=2020  x= dfrac{1}{5} end{array}  right.   text{Vậy}x=2020,x= dfrac{1}{5}$

buianhtuan · Answer

$ 5x^{2} - 10100x = x - 2020 $   &rArr; $ 5x^{2} - 10100 x - x + 2020 = 0 $   &rArr; $ 5x ( x - 2020 ) - ( x - 2020 ) = 0 $   &rArr; $ ( 5x - 1 ) ( x - 2020 ) = 0 $   &rArr;  ( left[  begin{array}{l}5x-1=0  x-2020=0 end{array}  right. )    &rArr;  ( left[  begin{array}{l}x= dfrac{1}{5}  x=2020 end{array}  right. )    Vậy $ x =  dfrac{1}{5} $ hoặc $ x = 2020 $