端午节买粽子,每个肉粽比素粽多1元,购买10个肉粽和5个素粽共用去70元,设每个肉粽 x 元,则可列方程为 ( )
10 x + 5 ( x - 1 ) = 70
10 x + 5 ( x + 1 ) = 70
10 ( x - 1 ) + 5 x = 70
10 ( x + 1 ) + 5 x = 70
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