第76页 - 强化拓展卷六年级数学苏教版提优版

$=\frac {9}{36}÷(\frac {3}{4}－\frac {7}{16}+\frac {1}{4})$

$=\frac {9}{36}÷[(\frac {3}{4}+\frac {1}{4})－\frac {7}{16}]$

$=\frac {9}{36}÷\frac {9}{16}$

$=\frac {1}{4}×\frac {16}{9}$

$=\frac {4}{9}$

$ =(\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}$

$=\frac {5}{8}×\frac {11}{10}+\frac {3}{8}×\frac {10}{11}$

$=\frac {11}{10}×(\frac {5}{8}+\frac {3}{8})$

$=\frac {11}{10}×1$

$=\frac {11}{10}$

$=17.5－(4.25+5.75)$

$=17.5－10$

$=7.5$

$=\frac {16}{12}－\frac {7}{12}+\frac {9}{20}－\frac {11}{30}+\frac {13}{42}－\frac {15}{56}$

$=\frac {15}{20}+\frac {9}{20}－\frac {11}{30}+\frac {13}{42}－\frac {15}{56}$

$=\frac {36}{30}－\frac {11}{30}+\frac {13}{42}－\frac {15}{56}$

$=\frac {35}{42}+\frac {13}{42}－\frac {15}{56}$

$=\frac {64}{56}－\frac {15}{56}$

$=\frac {49}{56}$

$=\frac {7}{8}$