Nhan da thuc-don thuc

P

pinkylun

$80=79+1=x+1$

$g(x)=1969-80x+80x^2-80x^3+80x^4-...+80x^{1968}-80x^{1969}$

$=1969-(x+1)x+(x+1)x^2-(x+1)x^3+...-(x+1)x^{1969}$

$=1969-x-x^2+x^2+x^3-x^3-x^4+...-x^{1969}-x^{1970}$

$= 1969-x-x^{1970}$

$=1890-79^{1970}$ :-SS :-SS
 
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