第78页 - 苏教版六年级数学同步练习答案（上下册）

B

$1\frac{1}{2}$

8

$\frac{3}{7}$

0

$1\frac{1}{4}$

$\frac{1}{5}$

$\frac{2}{3}$

$3\frac{1}{3}$

$=\frac {3}{8} ×\frac {3}{2}$

$=\frac {9}{16}$

$=(6-\frac {28}{5}) ×\frac {2}{5}$

$=\frac {2}{5 } ×\frac {2}{5}$

$=\frac {4}{25}$

$=\frac {1}{7} ×(\frac {6}{13}+\frac {8}{13})$

$=\frac {1}{7} ×\frac {14}{13}$

$=\frac {2}{13}$

$=(\frac {3}{4}-\frac {3}{4}) ×8$

$=0 ×8$

$=0$

$=\frac {7}{16} ×45-\frac {7}{16} ×45$

$=(\frac {7}{16}-\frac {7}{16}) ×45$

$=0$

$=\frac {3}{5} \div (\frac {1}{12} ×\frac {5}{6})$

$=\frac {3}{5} ×\frac {72}{5}$

$=\frac {216}{25}$

$\begin {aligned}解：\frac {7}{5}x&=21\\x &=15\end {aligned}$

$\begin {aligned}解：\frac {5}{7}x&=\frac {1}{14}\\x &=\frac {1}{10}\end {aligned}$

$\begin {aligned}解：\frac {7}{12}x&=84\\x &=144\end {aligned}$