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電子課本網 › 第68頁

第68頁

信息發(fā)布者：

$??=\frac {15}{20}+\frac {12}{20}-\frac 5{20}??$

$?? =\frac {11}{10}??$

$??=\frac {96}{120}+\frac {20}{120}-\frac {45}{120}??$

$?? =\frac {71}{120}??$

$??=\frac {36}{120}+\frac {100}{120}-\frac {105}{120}??$

$?? =\frac {31}{120}??$

$??=\frac {21}{24}+\frac 8{24}+\frac {20}{24}??$

$?? =\frac {49}{24}??$

$??=\frac {35}{42}-\frac {10}{42}-\frac {18}{42}??$

$?? =\frac 16??$

$??=\frac {20}{20}-\frac {15}{20}+\frac 6{20}??$

$?? =\frac {11}{20}??$

$??\frac 12-\frac 15-\frac 1{10}=\frac 15(??噸)$

$答：還剩?? \frac 15??噸。$

$??\frac 12+\frac 13-\frac 14=\frac 7{12}(??噸)$

$答：友誼糧店有雜糧?? \frac 7{12}??噸。$

$? \frac 16?$

$? \frac 13?$

$? \frac 14?$

$? \frac 3{10}?$

$? \frac 14?$

$? \frac 15?$

$?? \frac 1{10}??$

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