第21页 - 强化拓展卷六年级数学苏教版提优版

$\begin{aligned}解：2x&=24.7－2.7\\2x&=22\\x&=22÷2\\x&=11\end{aligned}$

$\begin{aligned}解：\frac {1}{3}x&=\frac {1}{3}\\x&=\frac {1}{3}÷\frac {1}{3}\\x&=1\end{aligned}$

$ \begin{aligned}解：\frac {2}{7}x&=\frac {11}{6}－1 \\ \frac {2}{7}x&=\frac {5}{6} \\ x&=\frac {5}{6}×\frac {7}{2} \\ x&=\frac {35}{12} \\ \end{aligned}$

4

80

580

1:4

扇形

$\begin{aligned}解：0.9x&=2.7×0.4\\x&=2.7×0.4÷0.9\\x&=1.2\end{aligned}$

$\begin{aligned}解：25x&=6\\x&=6÷25\\x&=\frac {6}{25}\end{aligned}$

$\begin{aligned}解：0.2x&=4.5\\x&=4.5÷0.2\\x&=22.5\end{aligned}$

$=\frac {5}{6}×\frac {2}{3}+\frac {4}{9}×6$

$=\frac {5}{9}+\frac {24}{9}$

$=\frac {29}{9}$

$=12+5$

$=17$

$=0.16+4÷(\frac {1}{4})$

$=0.16+4×4$

$=0.16+16$

$=16.16$

2.5