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電子課本網(wǎng) › 第76頁

第76頁

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???$=\frac {9}{36}÷(\frac {3}{4}－\frac {7}{16}+\frac {1}{4})$???
???$=\frac {9}{36}÷[(\frac {3}{4}+\frac {1}{4})－\frac {7}{16}]$???
???$=\frac {9}{36}÷\frac {9}{16}$???
???$=\frac {1}{4}×\frac {16}{9}$???
???$=\frac {4}{9}$???
?$ ??=(\frac {13}{17}+1)×\frac {17}{8}??$?
?$ ??=\frac {13}{8}+\frac {17}{8}??$?
?$ ??=\frac {30}{8}??$?
?$ ??=\frac {15}{4}??$?
???$=3.7×99+3.7×1$???
???$=3.7×(99+1)$???
???$=3.7×100$???
???$=370$???
???$=0.925×99+0.925×1$???
???$=0.925×(99+1)$???
???$=0.925×100$???
???$=92.5$???
???$=0.4×8×12.5×2.5$???
???$=(0.4×2.5)×(8×12.5)$???
???$=1×100$???
???$=100$???
???$=\frac {3}{8}×\frac {7}{4}－\frac {3}{4}×\frac {3}{8}+\frac {3}{8}×1$???
???$=\frac {3}{8}×(\frac {7}{4}－\frac {3}{4}+1)$???
???$=\frac {3}{8}×2$???
???$=\frac {3}{4}$???
???$=\frac {2}{3}×(\frac {4}{15}+\frac {11}{15})$???
???$=\frac {2}{3}×1$???
???$=\frac {2}{3}$???
???$=\frac {3}{4}×\frac {5}{8}+\frac {5}{4}×\frac {5}{8}$???
???$=\frac {5}{8}×(\frac {3}{4}+\frac {5}{4})$???
???$=\frac {5}{8}×2$???
???$=\frac {5}{4}$???
???$=9.7×(1.25×0.8)$???
???$=9.7×1$???
???$=9.7$???
??$ ?=1－(\frac {1}{6}+\frac {2}{12})?$??
??$ ?=1－\frac {4}{12}$??
??$=1－\frac {1}{3}?$??
??$ ?=\frac {2}{3}?$??
???$=\frac {5}{8}×\frac {11}{10}+\frac {3}{8}×\frac {10}{11}$???
???$=\frac {11}{10}×(\frac {5}{8}+\frac {3}{8})$???
???$=\frac {11}{10}×1$???
???$=\frac {11}{10}$???
???$=17.5－(4.25+5.75)$???
???$=17.5－10$???
???$=7.5$???
???$=\frac {16}{12}－\frac {7}{12}+\frac {9}{20}－\frac {11}{30}+\frac {13}{42}－\frac {15}{56}$???
???$=\frac {15}{20}+\frac {9}{20}－\frac {11}{30}+\frac {13}{42}－\frac {15}{56}$???
???$=\frac {36}{30}－\frac {11}{30}+\frac {13}{42}－\frac {15}{56}$???
???$=\frac {35}{42}+\frac {13}{42}－\frac {15}{56}$???
???$=\frac {64}{56}－\frac {15}{56}$???
???$=\frac {49}{56}$???
???$=\frac {7}{8}$???
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