文档介绍：1、÷[14-(+)]
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3、[60-(+)]÷
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5、÷-×
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7、20×[(-)÷+]
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9、28-(+×)
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11、×+×
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13、777×9+1111×3
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15、×〔-(+)〕
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17、(+×4)÷5
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19、×4÷(6+3)
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21、×25×+
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23、2÷+÷2
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25、194-÷×
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27、÷×
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29、5180-705×6
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2、24÷-×
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4、(4121+2389)÷7
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6、671×15-974
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8、469×12+1492
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10、405×(3213-3189)
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12、÷(×35)
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14、×[(10-)÷]
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16、××
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18、×-
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20、×+
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22、++
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24、××
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26、×102 100-
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28、++1
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30、×+
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31、÷[14-(+)]
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33、[60-(+)]÷
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35、÷-×
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37、20×[(-)÷+]
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39、28-(+×)
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41、×+×
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43、777×9+1111×3
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45、×〔-(+)〕
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47、(+×4)÷5
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49、×4÷(6+3)
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51、×25×+
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53、5180-705×6
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55、24÷-×
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32、(4121+2389)÷7
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34、671×15-974
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36、469×12+1492
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38、405×(3213-3189)
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40、÷(×35)
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42、×[(10-)÷]
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44、×× ×-
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46、×+ +
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48、×× ×102 100-
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50、++1 ×+
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52、87×52+87×48
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54、×-×
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56、×+×5.