why I lose some assets when the deal is done

[cryptosile]

I think the 9.684292078249 and the 9.606147934678 have the most significant bits.  So you need to start your equations with those.

round ( 91.69 CNY * 9.684292078249 ) = 887.95 BTSBOTS

round ( 966.01 CNY * 9.606147934678 ) = 18885.78 BTSBOTS

So, you can't start with the two inputs with lesser resolution and arrive at the correct higher resolution number.

[blinkwang182]

FOR EXAMPLE:

ASK-a3291a06  MARKET
ASK-a3291a06    blinkwang182
fill ask @ 9.684292078249 BTSBOTS / CNY
ask proceeds @ 9.684292078249 BTSBOTS / CNY
91.69 CNY
887.95 BTSBOTS
0.00 BTS

ASK-4f3474bc  MARKET
ASK-4f3474bc    blinkwang182
fill ask @ 9.606147934678 BTSBOTS / CNY
ask proceeds @ 9.606147934678 BTSBOTS / CNY
1,966.01 CNY
18,885.78 BTSBOTS
0.00 BTS

I don't understand the problem. Can you write the "before" state, the "after" state, and what you expected to see?

887.95 BTSBOTS/91.69 CNY =9.68426218780674,why not the 9.684292078249?

[toast]

FOR EXAMPLE:

ASK-a3291a06  MARKET
ASK-a3291a06    blinkwang182
fill ask @ 9.684292078249 BTSBOTS / CNY
ask proceeds @ 9.684292078249 BTSBOTS / CNY
91.69 CNY
887.95 BTSBOTS
0.00 BTS

ASK-4f3474bc  MARKET
ASK-4f3474bc    blinkwang182
fill ask @ 9.606147934678 BTSBOTS / CNY
ask proceeds @ 9.606147934678 BTSBOTS / CNY
1,966.01 CNY
18,885.78 BTSBOTS
0.00 BTS

I don't understand the problem. Can you write the "before" state, the "after" state, and what you expected to see?

[blinkwang182]

FOR EXAMPLE:

ASK-a3291a06  MARKET
ASK-a3291a06    blinkwang182
fill ask @ 9.684292078249 BTSBOTS / CNY
ask proceeds @ 9.684292078249 BTSBOTS / CNY
91.69 CNY
887.95 BTSBOTS
0.00 BTS

ASK-4f3474bc  MARKET
ASK-4f3474bc    blinkwang182
fill ask @ 9.606147934678 BTSBOTS / CNY
ask proceeds @ 9.606147934678 BTSBOTS / CNY
1,966.01 CNY
18,885.78 BTSBOTS
0.00 BTS