s=1+2+3+4+.......+10
s=10+9+8+.........1
s=11+11+11+11.......+11
s=11×5(10÷2)
s=55
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s=1+2+3+4+.......+10
s=10+9+8+.........1
s=11+11+11+11.......+11
s=11×5(10÷2)
s=55