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有a名男生和b名女生在社区做义工,他们为建花坛搬砖.男生每人搬了40块,女生每人...
有a名男生和b名女生在社区做义工,他们为建花坛搬砖.男生每人搬了40块,女生每人搬了30块.这a名男生和b名女生一共搬了 块砖(用含a、b的代数式表示).
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