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電子課本網(wǎng) › 第25頁

第25頁

信息發(fā)布者：
?$\frac {1}{15}$?
?$\frac {1}{6}$?
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}?$
?$=(4×25)×0.27$?
?$=100×27$?
?$=27$?
?$=\frac {7}{16}×(9－7)$?
?$=\frac {7}{16}×2$?
?$=\frac {7}{8}$?
?$=3.8×99+3.9×1$?
?$=3.8×(99+1)$?
?$=3.8×100$?
?$=380$?
?$=\frac {9}{16}÷(\frac {6}{16}+\frac {1}{16})$?
?$=\frac {9}{16}÷\frac {7}{16}$?
?$=\frac {9}{16}×\frac {16}{7}$?
?$=\frac {9}{7}$?
?$=\frac {2}{5}÷(\frac {4}{5}×\frac {1}{4})$?
?$=\frac {2}{5}÷\frac {1}{5}$?
?$=\frac {2}{5}×5$?
?$=2$?
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