2000减3减6减9减·········减51减54等于多少
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2000减3减6减9减·········减51减54等于多少
![2000减3减6减9减·········减51减54等于多少](/uploads/image/z/3646325-29-5.jpg?t=2000%E5%87%8F3%E5%87%8F6%E5%87%8F9%E5%87%8F%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%E5%87%8F51%E5%87%8F54%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
2000-3-6-9-...-51-54
=2000-3×(1+2+...+18)
=2000-3×18×19/2
=2000-513
=1487
=2000-3×(1+2+...+18)
=2000-3×18×19/2
=2000-513
=1487