1 + 1 + ?
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Số các số hạng là:
( 20 - 1 ) :1 + 1 = 20
Tổng dãy số trên là:
( 1 + 20) x 20 : 2= 210
Bài này có nhiều cách giải nhưng cach này nhanh hơn !
= 20
k mk mk k lại
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1+1=2 k mình nha!
1+1=1=2