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第75頁(yè)

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C
?$\frac {1}{6}$? + ?$\frac {3}{10}$? + ?$\frac {1}{5}$?=?$\frac {2}{3}$?
答：一共占這箱糖果的?$\frac {2}{3}。$?
①③
青菜和番茄一共有多少千克? 
?$\frac {9}{10}$?-?$\frac {1}{5}$? + ?$\frac {9}{10}$?=?$\frac {8}{5}$? (千克)
答：一共有?$\frac {8}{5}$?千克。
?$\frac {11}{12}-\frac {1}{3} -\frac {1}{3}=\frac {1}{4}$?
答：正確的結(jié)果是?$\frac {1}{4}。$?
?$\frac {1}{3}$?
?$\frac {1}{3}$?
?$\frac {1}{6}$?
?$\frac {1}{6}$?
?$\frac {1}{2}$?
?$\frac {1}{4}$?
?$\frac {1}{6}$?
?$\frac {1}{12}$?
2
4
8
8
12
4
?$=1-\frac {1}{2}+\frac {1}{2}-\frac {1}{3}+\frac {1}{3}-\frac {1}{4}+\frac {1}{4}-\frac {1}{5}+\frac {1}{5}-\frac {1}{6}$?
?$=1-\frac {1}{6}$?
?$=\frac {5}{6}$?
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