第45页 - 强化拓展卷六年级数学苏教版提优版

8.3

2.24

12

70

3

$\frac {18}{25}$

0

28.26

$\begin{aligned}解：3x&=1.5\\x&=1.5÷3\\x&=0.5\end{aligned}$

$\begin{aligned}解：0.75x&=\frac {3}{8}\\x&=\frac {3}{8}÷\frac {3}{4}\\x&=\frac {3}{8}×\frac {4}{3}\\x&=\frac {1}{2}\end{aligned}$

$\begin{aligned}解：\frac {1}{10}x&=\frac {1}{24}\\x&=\frac {1}{24}÷\frac {1}{10}\\x&=\frac {5}{12}\end{aligned}$

$ =12.4－12$

$ =0.4$

$=6.85－3.85－2.7$

$=3－2.7$

$=0.3$

$=\frac {5}{7}×\frac {1}{9}+\frac {4}{7}×\frac {1}{9}$

$=\frac {1}{9}×(\frac {4}{7}+\frac {5}{7})$

$=\frac {1}{9}×\frac {9}{7}$

$=\frac {1}{7}$

$=\frac {1}{12}÷\frac {1}{2}+\frac {5}{6}$

$=\frac {1}{12}×2+\frac {5}{6}$

$=\frac {1}{6}+\frac {5}{6}$

$=1$

$=\frac {4}{9}×\frac {1}{6}+\frac {5}{9}×\frac {1}{6}$

$=\frac {1}{6}×(\frac {4}{9}+\frac {5}{9})$

$=\frac {1}{6}×1$

$=\frac {1}{6}$

$=24－1+\frac {3}{2}$

$=\frac {49}{2}$