電子課本網(wǎng) › 第82頁

第82頁

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$?\begin{aligned} 解：x &=740-410\\x&=330\end{aligned}?$

$?\begin{aligned} 解：x&=0.56÷0.8\\x&=0.7\end{aligned}?$

$?\begin{aligned}解：x&=15 + 7.2\\x&=22.2\end{aligned}?$

$?\begin{aligned}解：3x&=6.24-0.54\\3x &=5.7\\x &=1.9\end{aligned}?$

$?\begin{aligned}解：5x&=5.5+5\\5x &=10.5\\x &= 2.1\end{aligned}?$

$?\begin{aligned}解：4x&=60×8\\4x &=480\\x &=120\end{aligned}?$

$?\begin{aligned} 解：4.8x&=96\\x&=20\end{aligned}?$

$?\begin{aligned} 解：4x&=12.4\\x&=3.1\end{aligned}?$

$?\begin{aligned}解：1.7x+4.6& =8\\1.7x&=8-4.6\\1.7x &=3.4\\x& =2\end{aligned}?$

$解：設圖書角原來有故事書?x?本$

$?\begin{aligned}x-54&=76\\x&=54+76\\x&=130\end{aligned}?$

$答：圖書角原來有故事書?130?本。$

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