/ 2121*1 212/ 2212=?
/ 2121*1 212/ 2212=?
(121121121121/212121212121)*(121212121212/212212212212) =[(121*1001001001)/(21*10101010101)]*[(12*10101010101)/(212*1001001001)] =(121/21)*(12/212) =121/371
答:原式=1/21+2*101/21*101+4*10101/21*10101+14*1010101/21*1010101 =1/21+2/21+4/21+14/2...详情>>
答:详情>>