Ta có:
C=x5+y5C=x5+y5
=(x+y)5-5x4y-10x3y2-10x2y3-5xy4=(x+y)5−5x4y−10x3y2−10x2y3−5xy4
=(x+y)5-5xy(x3+y3)-10x2y2(x+y)=(x+y)5−5xy(x3+y3)−10x2y2(x+y)
=(x+y)5-5xy[(x+y)3-3xy(x+y)]-10(xy)2(x+y)=(x+y)5−5xy[(x+y)3−3xy(x+y)]−10(xy)2(x+y)
=35-5⋅(-10)⋅[33-3⋅(-10)⋅3]-10⋅(-10)2⋅3=35−5⋅(−10)⋅[33−3⋅(−10)⋅3]−10⋅(−10)2⋅3
=243+50⋅117-3000=243+50⋅117−3000
=3093=3093
950
11020
1295
x5+y5x5+y5 hả cou?
950
11020
1295
sao mik thấy hơi sai sai:)