Question

这道题的算式怎么写？

Answer 1

顺推；设小数为a，(1)1000xa=1000a; (2)1000a/100=10a;(3)10ax10=100a
(4)100a/1000=0.1a=78.67 则a=786.7
逆推：（1）78.67x1000=78670 (2) 78670/10=7867 (3) 7867X100=786700 (4)786700/1000=786.7

Answer 2

设此数为x，则
x×1000÷100×10÷1000=78.67
x=78.67×1000÷10×100÷1000=786.7

Answer 3

逆回去算啊。78.67*1000/10*100/1000=786.7

Answer 4

786.7 反向推算

追问

算式怎么写？

Answer 5

78.67×1000÷10×100÷1000=786.7