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    Work: Calculate the value of equation 11+12+13+14+15+16+17+18+19+20 .
    Question type: Mathematical calculation
    Solution:
          11+12+13+14+15+16+17+18+19+20
        =23+13+14+15+16+17+18+19+20
        =36+14+15+16+17+18+19+20
        =50+15+16+17+18+19+20
        =65+16+17+18+19+20
        =81+17+18+19+20
        =98+18+19+20
        =116+19+20
        =135+20
        =155
    Answer:11+12+13+14+15+16+17+18+19+20=155

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