212121212121分之121121121121乘212212212212分之121212121212...简便方法
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212121212121分之121121121121乘212212212212分之121212121212...简便方法
![212121212121分之121121121121乘212212212212分之121212121212...简便方法](/uploads/image/z/18956781-45-1.jpg?t=212121212121%E5%88%86%E4%B9%8B121121121121%E4%B9%98212212212212%E5%88%86%E4%B9%8B121212121212...%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95)
121121121121=1001001001*121
212121212121=10101010101*21
121212121212=10101010101*12
212212212212=1001001001*212
212121212121分之121121121121乘212212212212分之121212121212
=(1001001001*121)/(10101010101*21)*(10101010101*12)/(1001001001*212)
=121*12/21*212
=484/1484
212121212121=10101010101*21
121212121212=10101010101*12
212212212212=1001001001*212
212121212121分之121121121121乘212212212212分之121212121212
=(1001001001*121)/(10101010101*21)*(10101010101*12)/(1001001001*212)
=121*12/21*212
=484/1484