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電子課本網(wǎng) › 第29頁(yè)

第29頁(yè)

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?$ \frac {5}{9}$?
24.3
364
0.8
?$ \frac {6}{5}$?
?$9$?
?$\frac {2}{7}$?
49
?$\frac {1}{3}$?
?$\frac {4}{7}$?
?$\begin{aligned}解：\frac {4}{6}x+\frac {3}{6}x&=42\\\frac {7}{6}x&=42\\x&=42×\frac {6}{7}\\x&=36\end{aligned}$?
?$\begin{aligned}解：\frac {1}{5}x&=15\\x&=15÷\frac {1}{5}\\x&=15×5\\x&=75\end{aligned}$?
?$\begin{aligned}解：4x&=15.2+4.8\\4x&=20\\x&=20÷4\\x&=5\end{aligned}$?
?$=198－(59+41)$?
?$=198－100$?
?$=98$?
?$=\frac {3}{7}×\frac {5}{11}+\frac {5}{11}×\frac {4}{7}$?
?$=\frac {5}{11}×(\frac {3}{7}+\frac {4}{7})$?
?$=\frac {5}{11}×1$?
?$=\frac {5}{11}$?
?$=4×8×125$?
?$=4×(8×125)$?
?$=4×1000$?
?$=4000$?
?$=(9.46+0.54)－(\frac {4}{7}+\frac {3}{7})$?
?$=10－1$?
?$=9$?
?$=\frac {3}{4}×1+\frac {3}{4}×(\frac {2}{3}÷2)$?
?$=\frac {3}{4}×1+\frac {3}{4}×\frac {1}{3}$?
?$=\frac {3}{4}×(1+\frac {1}{3})$?
?$=\frac {3}{4}×\frac {4}{3}$?
?$=1$?
?$=\frac {5}{6}+\frac {7}{12}÷\frac {1}{2}$?
?$=\frac {5}{6}+\frac {7}{12}×2$?
?$=\frac {5}{6}+\frac {7}{6}$?
?$=2$?
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