Toán Lớp 6: 2+(2+1)+(n+2)+(n+3)+…+(2+10)=0
A n=5
B n=-10
C n=-5
Dn=0
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Toán Lớp 6: 2+(2+1)+(n+2)+(n+3)+…+(2+10)=0
A n=5
B n=-10
C n=-5
Dn=0
Comments ( 1 )
2+(2+1)+(n+2)+(n+3)+…+(2+10)=0
A n=5
B n=-10
C n=-5
D n=0
đáp án c