【急】!简便运算!(1) 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+1/78+1/91+1/105+1/120(2) 已知x、y是互不相等的自然数,当1/18=1/x+1/y时,求x+y.(3) 当A、B、C、D、E、F各是什么不同的自然数时,下式成立.1/20=1/A+1
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/15 03:00:44
![【急】!简便运算!(1) 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+1/78+1/91+1/105+1/120(2) 已知x、y是互不相等的自然数,当1/18=1/x+1/y时,求x+y.(3) 当A、B、C、D、E、F各是什么不同的自然数时,下式成立.1/20=1/A+1](/uploads/image/z/5427988-52-8.jpg?t=%E3%80%90%E6%80%A5%E3%80%91%21%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%21%281%29+1%2F3%2B1%2F6%2B1%2F10%2B1%2F15%2B1%2F21%2B1%2F28%2B1%2F36%2B1%2F45%2B1%2F55%2B1%2F66%2B1%2F78%2B1%2F91%2B1%2F105%2B1%2F120%282%29+%E5%B7%B2%E7%9F%A5x%E3%80%81y%E6%98%AF%E4%BA%92%E4%B8%8D%E7%9B%B8%E7%AD%89%E7%9A%84%E8%87%AA%E7%84%B6%E6%95%B0%2C%E5%BD%931%2F18%3D1%2Fx%2B1%2Fy%E6%97%B6%2C%E6%B1%82x%2By.%283%29+%E5%BD%93A%E3%80%81B%E3%80%81C%E3%80%81D%E3%80%81E%E3%80%81F%E5%90%84%E6%98%AF%E4%BB%80%E4%B9%88%E4%B8%8D%E5%90%8C%E7%9A%84%E8%87%AA%E7%84%B6%E6%95%B0%E6%97%B6%2C%E4%B8%8B%E5%BC%8F%E6%88%90%E7%AB%8B.1%2F20%3D1%2FA%2B1)
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