文档介绍：脱式计算
72×+ × ×
×+
×18÷ ÷÷ ÷
+÷
×0
脱式计算
72×+ × ×
×+
×18÷ ÷÷ ÷
+÷
×÷ ÷+ ÷÷ -
÷
×+× ÷－×
÷(＋)(＋)÷
(－)÷0＋.-(+ ×)
777×9+1111×30〔.815×.5-(+)〕
×4÷(6+3) ×25×+
194－÷× ÷×
24÷2.－×(4121+2389) ÷7
469×12+1492405×(3213-3189)
(10－)÷ ××
×++
×102100-
×× ×102
× ×－÷×
×+×（+×4）÷52÷+÷2
518