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第75頁

信息發(fā)布者：
?$=2+(\frac {9}{14}-\frac {3}{14})$?
?$=2+\frac 37$?
?$=2\frac {3}{7}$?
?$=\frac {3}{5}-\frac {1}{4}$?
?$=\frac {7}{20}$?
?$=\frac {19}{20}-\frac {9}{20}-\frac {2}{7}$?
?$=\frac {1}{2}-\frac {2}{7}$?
?$=\frac {3}{14}$?
?$=(\frac {1}{6}+\frac {5}{6})+(\frac {7}{8}-\frac {1}{8})$?
?$=1+\frac {3}{4}$?
?$=1\frac {3}{4}$?
?$=(\frac {5}{7}+\frac {2}{7})-(\frac {11}{13}+\frac {2}{13})$?
?$=1-1$?
?$=0$?
?$=(999\frac 89+\frac 19)+(99\frac 89+\frac 19)+$?
?$(9\frac 89+\frac 19)$?
?$=1000+100+10$?
?$=1110$?
?$=4×5+(\frac {1}{10}+\frac {11}{100}+\frac {111}{1000}+\frac {1111}{10000}+\frac {11111}{100000})$?
?$=20+(0.1+0.11+0.111+0.1111+0.11111)$?
?$=20.54321$?
?$1-\frac {3}{5}-\frac {8}{25}=\frac {2}{25}$?
答：還剩下總票數(shù)的?$\frac {2}{25}。$?
?$\frac {12}{5}-\frac {1}{3}=\frac {31}{15}($?米?$)$?
?$\frac {12}{5}+\frac {12}{5}+\frac {31}{15}+\frac {31}{15}=\frac {134}{15}($?米?$)$?
答：這塊桌布的周長是?$\frac {134}{15}$?米。
?$\frac {4}{7}+\frac {5}{9}-1=\frac {8}{63}$?
答：這時兩車的距離占全程的?$\frac {8}{63}。$?
?$\frac {13}{60}$?
?$\frac {1}{6}$?
?$\frac {14}{3}+\frac {35}{6}+\frac {15}{2}?15=3($?千克?$)$?
?$3÷3=1($?千克?$) $?
答：一個空木箱有?$1$?千克重。
?$=\frac {1}{1×2}+\frac {3?1}{1×2×3}+\frac {4?1}{1×2×3×4}+\frac {5?1}{1×2×3×4×5}+$?
?$ \frac {6?1}{1×2×3×4×5×6}+\frac {7-1}{1×2×3×4×5×6×7}$?
?$=\frac {1}{1×2}+\frac {1}{1×2}?\frac {1}{1×2×3}+\frac {1}{1×2×3}-\frac {1}{1×2×3×4}+$?
?$…+ \frac {1}{1×2×3×4×5×6}-\frac {1}{1×2×3×4×5×6×7}$?
?$=\frac {1}{1×2}+\frac {1}{1×2}- \frac {1}{1×2×3×4×5×6×7}$?
?$=1-\frac {1}{5040}$?
?$=\frac {5039}{5040} $?
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