1+3+5+…+15+17+19 列出简便运算怎么写？ 1+3+5+...+17+19怎么用简便方法计算
1+3+5\uff0b\u2026+17+19\u7528\u7b80\u4fbf\u65b9\u6cd5\u8ba1\u7b971\uff5e19\u517119\u9879\u662f\u4e2a\u5947\u6570\u9879\uff0c\u90a3\u4e48\u4f60\u628a\uff081+19\uff09\u770b\u6210\u4e00\u9879\uff0c\u4ee5\u6b64\u7c7b\u63a8\uff0c\uff083+17\uff09......\uff089+11\uff09\uff0c\u90a3\u4e48\u5c31\u7b49\u4e8e20*5=100
\u60a8\u597d\uff1a
1+3+5+...+17+19
=\uff081+19\uff09+\uff083+17\uff09+....
=20x5
=100
\u5f88\u9ad8\u5174\u4e3a\u60a8\u89e3\u7b54\uff0c\u795d\u4f60\u5b66\u4e60\u8fdb\u6b65\uff01\u3010\u5b66\u4e60\u5b9d\u5178\u3011\u56e2\u961f\u4e3a\u60a8\u7b54\u9898\u3002
\u6709\u4e0d\u660e\u767d\u7684\u53ef\u4ee5\u8ffd\u95ee\uff01\u5982\u679c\u60a8\u8ba4\u53ef\u6211\u7684\u56de\u7b54\u3002
\u8bf7\u70b9\u51fb\u4e0b\u9762\u7684\u3010\u9009\u4e3a\u6ee1\u610f\u56de\u7b54\u3011\u6309\u94ae\uff0c\u8c22\u8c22\uff01
\u5982\u679c\u6709\u5176\u4ed6\u9700\u8981\u5e2e\u52a9\u7684\u9898\u76ee\uff0c\u60a8\u53ef\u4ee5\u6c42\u52a9\u6211\u3002\u8c22\u8c22\uff01\uff01
=(1+19)*19/2
=190
=（1+19）*10/2
=20*5
=100
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