数列{an}中,a1=1,a2=2+3,a3=4+5+6,a4=7+8+9+10,...,a10,...,则a10等于.( )A、610 B、510 C、505 D、750
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![数列{an}中,a1=1,a2=2+3,a3=4+5+6,a4=7+8+9+10,...,a10,...,则a10等于.( )A、610 B、510 C、505 D、750](/uploads/image/z/1747828-28-8.jpg?t=%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2Ca1%3D1%2Ca2%3D2%2B3%2Ca3%3D4%2B5%2B6%2Ca4%3D7%2B8%2B9%2B10%2C...%2Ca10%2C...%2C%E5%88%99a10%E7%AD%89%E4%BA%8E.%28+%29A%E3%80%81610+B%E3%80%81510+C%E3%80%81505+D%E3%80%81750)
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