1+2+3+4+5+6+7+8+9+..................+100=?
2 câu trả lời
1+2+3+4+5+6+7+8+9+..................+100
=(1+100)*[(100-1)/1+1]/2
=101*100/2
=101*50
=5050
1+2+3+4+5+6+7+8+9+..................+100=?
1+2+3+4+5+6+7+8+9+..................+100
=(1+100)*[(100-1)/1+1]/2
=101*100/2
=101*50
=5050
