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電子課本網(wǎng) › 第55頁

第55頁

信息發(fā)布者：
?$=\frac {9}{12}+\frac {2}{12}-\frac {8}{12}$?
?$=\frac {11}{12}-\frac {8}{12}$?
?$=\frac {1}{4}$

?
?$=\frac {63}{72}-\frac {18}{72}+\frac {32}{72}$?
?$=\frac {5}{8}+\frac {32}{72}$?
?$=\frac {77}{72}$?
?$=\frac {15}{18}-(\frac {12}{18}-\frac {2}{18})$?
?$=\frac {15}{18}-\frac {5}{9}$?
?$=\frac {5}{18}$?
?$=\frac {12}{24}+\frac {16}{24}+\frac {15}{24}$?
?$=\frac {7}{6}+\frac {15}{24}$?
?$=\frac {43}{24}$?
?$=\frac {56}{70}-\frac {50}{70}+\frac {35}{70}$?
?$=\frac {3}{35}+\frac {35}{70}$?
?$=\frac {41}{70}$?
?$=\frac {36}{40}-(\frac {30}{40}+\frac {5}{40})$?
?$=\frac {36}{40}-\frac {7}{8}$?
?$=\frac {1}{40}$?
?$\frac {2}{5}+\frac {3}{8}+\frac {1}{10}$?
?$=\frac {16}{40}+\frac {15}{40}+\frac {4}{40}$?
?$=\frac {35}{40}$?
?$=\frac {7}{8}($?噸)
答：這堆沙子原有?$\frac {7}{8}$?噸.

$\frac {3}{4}+\frac {3}{4}-\frac {1}{2}=1 ($米)
答：兩次一共截去$1$米。
?$1-\frac {1}{4}-\frac {2}{5}$?
?$=\frac {3}{4}-\frac {2}{5}$?
?$=\frac {7}{20}$?
答：蘋果樹苗的培育的面積占這塊地的?$\frac {7}{20}.$
?
?$\frac {1}{6}+\frac {1}{8}+\frac {1}{4}=\frac {13}{24}$?
答：伙食、服裝和水電氣的費用共占總支出的?$\frac {13}{24}。$?

?$1-\frac {13}{24}=\frac {11}{24}$?
答：其他費用占總支出的?$\frac {11}{24}。$?
?$1-\frac {1}{4}-\frac {3}{8}=\frac {3}{8}$?
答：這根彩帶還剩全長的?$\frac {3}{8}.$?
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