Calculation: 120-119 + 118-117 + 116-115 + +4-3+2-1=______ ．

120-119+118-117+116-115+… +4-3+2-1=（120-119）+（118-117）+（116-115）+… +(4-3) + (2-1) = 1 × 60 = 60

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