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第14頁

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$??\begin{aligned}解：x &=24-17\\x &=7\end{aligned}??$

$??\begin{aligned}解：x &=530+460\\x &=990\end{aligned}??$

$?\begin{aligned}解：x& =7.5-2.7\\x &=4.8\end{aligned}?$

$??\begin{aligned}解：x &=4.5÷9\\x &=0.5\end{aligned}??$

$??\begin{aligned}解：x &= 2.5×0.4\\x &=1\end{aligned}??$

$??\begin{aligned}解：x& =240÷40\\x &=6\end{aligned}??$

$??\begin{aligned}解：3x& =20-5\\3x &=15\\x &=5\end{aligned}??$

$??\begin{aligned}解：5x&=6.8+1.2\\5x&=8\\x&=1.6\end{aligned}??$

$??\begin{aligned} 解：4x&=1.6×5\\4x&=8\\x&=2\end{aligned}??$

$解：設(shè)《數(shù)學故事》每本售價?x?元$

$?\begin{aligned}14+x&=30\\x&=30-14\\x&=16\end{aligned}?$

$答：每本《數(shù)學故事?》16 ?元。$

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