M = 22010-(22009 + 22008+....+21+20
Đặt A =( 22009+22008+...21 +20)
Suy ra 2A = 22010+22009+22008+...22+2
Suy ra 2A-A = ( 22010+22009+22008+...+22+2) - (22009+ 22008+...+21+20)
Suy ra A= 22010-20
Suy ra M = 22010-A=22010 - 22010+20=1
Vậy M=1
Đúng nha
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