计算1/5×8+1/8×11+1/11×14+1/14×17+1/17×20,它的结果是多少,
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![计算1/5×8+1/8×11+1/11×14+1/14×17+1/17×20,它的结果是多少,](/uploads/image/z/133168-40-8.jpg?t=%E8%AE%A1%E7%AE%971%EF%BC%8F5%C3%978%2B1%EF%BC%8F8%C3%9711%2B1%EF%BC%8F11%C3%9714%2B1%EF%BC%8F14%C3%9717%2B1%EF%BC%8F17%C3%9720%2C%E5%AE%83%E7%9A%84%E7%BB%93%E6%9E%9C%E6%98%AF%E5%A4%9A%E5%B0%91%2C)
计算1/5×8+1/8×11+1/11×14+1/14×17+1/17×20,它的结果是多少,
计算1/5×8+1/8×11+1/11×14+1/14×17+1/17×20,它的结果是多少,
计算1/5×8+1/8×11+1/11×14+1/14×17+1/17×20,它的结果是多少,
1/5×8+1/8×11+1/11×14+1/14×17+1/17×20
=1/3(1/5-1/8+1/8-1/11+...+1/17-1/20)
=1/3(1/5-1/20)
=1/3*3/20
=1/20
1/3是(8-5),(11-8),等的倒数.1/3×(1/5-1/8)=1/5×8
1/3(1/5-1/8+1/8-1/11~~~-1/20)
=1/20
1/5×8+1/8×11+1/11×14+1/14×17+1/17×20
=1/3(1/5-1/8+1/8-1/11+...+1/17-1/20)
=1/3(1/5-1/20)
=1/3*3/20
=1/20哪来的1/3,请用文字叙述!要详细8与5的差是1/3, 11与8的差是1/3 1/5-1/8=1/3(1/5-1/8) 其他也是这样8与5的差是3, ...
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1/5×8+1/8×11+1/11×14+1/14×17+1/17×20
=1/3(1/5-1/8+1/8-1/11+...+1/17-1/20)
=1/3(1/5-1/20)
=1/3*3/20
=1/20
收起
1/5×8+1/8×11+1/11×14+1/14×17+1/17×20,
=(1/5-1/8+1/8-1/11+1/11-1/14+1/14-1/17+1/17-1/20)/3
=(1/5-1/20)/3
=1/20
1/5*8+1/8*11+1/11*14+1/14*17+1/17*20 = 6.6384835752483
=(1/5-1/8)÷3+(1/8-1/11)÷3+(1/11-1/14)÷3+(1/14-1/17)÷3+(1/17-1/20)÷3
=(1/5-1/20)÷3
=1/20