2+4加6+8最后是拿到十六十八二十用合适的方法计算 2+4+6+...+16+18+20用合适的方法计算公式是什...
2+4+6+\u2026+16+18+20\u7528\u5408\u9002\u7684\u65b9\u6cd5\u8ba1\u7b972+4+6+\u2026+16+18+20
=\uff082+20\uff09+\uff084+18\uff09+\uff086+16\uff09+\uff088+14\uff09+\uff0810+12\uff09
=22+22+22+22+22
=22x5
=110
\u8c22\u8c22\uff0c\u8bf7\u91c7\u7eb3
(2+4+6+...+16+18+20+
20+18+16+...+6+4+2)\u00f72=22\u00d710\u00f72=110
=（2+20）×10÷2
=22×10÷2
=110
绛旓細2:4=4:8=8:16 2:8=4:16
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