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第86頁(yè)

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B
?$\begin{aligned}解：x&=\frac {1}{2}+\frac {3}{14}+\frac {4}{7}\\x&=\frac {5}{7}+\frac {4}{7}\\x&=\frac {9}{7}\end{aligned}$?
?$\begin{aligned}解：x&=1+\frac {1}{3}-\frac {3}{4}\\x&=\frac {4}{3}-\frac {3}{4}\\x&=\frac {7}{12}\end{aligned}$?
??$=(\frac {13}{11}-\frac {1}{11})-(\frac {3}{5}+\frac {2}{5})$??
??$=\frac {12}{11}-1$??
??$=\frac {1}{11}$??
??$=(\frac {5}{4}-\frac {1}{4})-(\frac {2}{7}+\frac {5}{7})$??
??$=1-1$??
??$=0$??
??$=(\frac {11}{8}-\frac {5}{8})+(\frac {3}{7}+\frac {4}{7})$??
??$=\frac {3}{4}+1$??
??$=\frac {7}{4}$??
??$=(\frac {1}{6}+\frac {5}{6})+(\frac {7}{8}-\frac {1}{8})$??
??$=1+\frac {3}{4}$??
??$=1 \frac {3}{4}$??
??$\frac 35+\frac 12-1=\frac {1}{10}$??
答：兩種都訂閱的占全班人數(shù)的??$\frac {1}{10}。$??
??$1-\frac 34=\frac 14($??杯)
??$\frac 14+\frac 13=\frac {7}{12}($??杯)
??$1-\frac 14-\frac {7}{12}=\frac 16($??杯)
答：溢出來(lái)的水是??$\frac 16$??杯。
??$\frac 78+(0.75-\frac 13)=\frac {31}{24}($??噸)
答：這時(shí)兩個(gè)茶園的茶葉相差??$\frac {31}{24}$??噸。
??$\frac {14}{3}+\frac {35}{6}+\frac {15}{2}-15=3 ($??千克)
$3÷3=1\ (??千克)$
$答：一個(gè)木箱重??1千克。$
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