lz您好
1. 2398765410
2. 2.142857142857142857. 2009位上是5
3. 设原来商是a,余数是b,除数是S,那么
aS + b = 1978, (a-9)S + b = 1798
所以9S = 180 S=20, 即20a + b = 1978
又0
╮(╯▽╰)╭,我又来提问数学题了,懒得写,萌你个萌!会多少答多少,尽量全答,应用题要写算式!
lz您好
1. 2398765410
2. 2.142857142857142857. 2009位上是5
3. 设原来商是a,余数是b,除数是S,那么
aS + b = 1978, (a-9)S + b = 1798
所以9S = 180 S=20, 即20a + b = 1978
又0