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第45頁(yè)

信息發(fā)布者：
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}$?
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