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第21頁

信息發(fā)布者：
??$\begin{aligned}解：2x&=24.7－2.7\\2x&=22\\x&=22÷2\\x&=11\end{aligned}$??
??$\begin{aligned}解：\frac {1}{3}x&=\frac {1}{3}\\x&=\frac {1}{3}÷\frac {1}{3}\\x&=1\end{aligned}$??
??$ \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}$??
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扇形
??$\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
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