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第71頁

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?$ =2-\frac 3{10}$?
?$ =1\frac 7{10}$?
?$ =1-\frac 13×\frac 17$?
?$ =1-\frac 1{21}$?
?$ =\frac {20}{21}$?
?$ =[1-\frac 38]×\frac 65$?
?$ =\frac 58×\frac 65$?
?$ =\frac 34$?
?$ =5-(\frac 67×\frac {14}3+\frac 6{13})$?
?$ =5-4-\frac 6{13}$?
?$ =\frac 7{13}$?
?$ =6÷(\frac {12}{20}+\frac {15}{20})$?
?$ =6÷\frac {27}{20}$?
?$ =6×\frac {20}{27}$?
?$ =\frac {40}9$?
?$ =1-\frac 67×\frac 73×\frac 3{16}$?
?$ =1-2×\frac 3{16}$?
?$ =1-\frac 38$?
?$ =\frac 58$?
?$ =(\frac 65+\frac 45)×\frac 2{15}$?
?$ =2×\frac 2{15}$?
?$ =\frac 4{15}$?
?$ =\frac 6{11}×\frac 14-\frac 14×\frac 5{11}$?
?$ =\frac 14×(\frac 6{11}-\frac 5{11})$?
?$ =\frac 14×\frac 1{11}$?
?$ =\frac 1{44}$?
?$ =(\frac 7{11}+\frac 4{11})×\frac 79$?
?$ =1×\frac 79$?
?$ =\frac 79$?
?$ =\frac {32}{33}×(33-1)$?
?$ =\frac {32}{33}×33-\frac {32}{33}$?
?$ =32-\frac {32}{33}$?
?$ =31\frac 1{33}$?
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