Làm nhầm làm lại nhé
Ta có:
|x + 10|5 + |x - 10|5
= |x + 10|5 + |10 - x|5
= |x5 + 50x4 + 1000x3 + 10000x2 + 50000x + 100000| + |-x5 + 50x4 - 1000x3 + 10000x2 - 50000x + 100000|
\(\ge\)|100x4 + 20000x2 + 200000|
\(\ge\)|200000| = 200000
Dấu = xảy ra khi x = 0
Ta có:
|x + 10|5 + |x - 10|5
= |x + 10|5 + |10 - x|5
= |x5 + 50x4 + 1000x3 + 10000x2 + 50000x + 1000000| + |-x5 + 50x4 - 1000x3 + 10000x2 - 50000x + 1000000|
\(\ge\)|100x4 + 20000x2 + 2000000|
\(\ge\)|2000000| = 2000000
Dấu = xảy ra khi x = 0