（0.2345*3456-1234*0.4567）/【（6666²-5555²）*4444】
=[(0.4567-0.2222)×3456-(3456-2222)×0.4567]／[(6666-5555)(6666+5555)×4444]
=(0.4567×3456-0.2222×3456-3456×0.4567+2222×0.4567)/(1111×12221×4444)
=0.2222×(4567-3456)/(1111×12221×4444)
=0.1×1111/(1111×12221×2)
=1/244420求分析这做的还不清楚吗？还要分析？