第25页 - 强化拓展卷六年级数学苏教版提优版

$\frac {1}{15}$

$\frac {1}{6}$

80

30

$\frac {10}{7}$

$\frac {3}{5}$

$\frac {2}{5}$

$\frac {7}{12}$

$\frac {5}{3}$

$\frac {1}{64}$

$\begin{aligned}解：21x&=4.2\\x&=4.2÷21\\x&=0.2\end{aligned}$

$\begin{aligned}解：\frac {10}{15}x－\frac {3}{15}x&=1\\\frac {7}{15}x&=1\\x&=\frac {15}{7}\end{aligned}$

$\begin{aligned}解：0.4x&=20+4\\0.4x&=24\\x&=24÷0.4\\x&=60\end{aligned}$

$ =5\frac {3}{8}－1\frac {3}{8}+\frac {5}{9}$

$ =4+\frac {5}{9}$

$ =4\frac {5}{9}$

$=(4×25)×0.27$

$=100×27$

$=27$

$=\frac {7}{16}×(9－7)$

$=\frac {7}{16}×2$

$=\frac {7}{8}$

$=3.8×99+3.9×1$

$=3.8×(99+1)$

$=3.8×100$

$=380$

$=\frac {9}{16}÷(\frac {6}{16}+\frac {1}{16})$

$=\frac {9}{16}÷\frac {7}{16}$

$=\frac {9}{16}×\frac {16}{7}$

$=\frac {9}{7}$

$=\frac {2}{5}÷(\frac {4}{5}×\frac {1}{4})$

$=\frac {2}{5}÷\frac {1}{5}$

$=\frac {2}{5}×5$

$=2$