估算41×18的积大约是2J/v+?9t1N.D;@(D-[3@)q-H9j0X0~5b:m:Q-Z，564÷9的商是6R/s0g3w2p)x9\3Y-~-_.L1d3V6W.b/}多。'u){,O9_-[:n*b