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If 10a+4b＝32 and 9a+2b＝24, what is the value of a+2b?____
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解析：
两式相减得出(10a+4b) -(9a+2b)=a+2b=8。
两式相减得出(10a+4b) -(9a+2b)=a+2b=8。
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