大米7袋和面粉4袋共重1640千克,3袋大米和面粉6袋共重1560千克,问每袋大米和每袋面粉重多少千克?用算术
人气：200 ℃ 时间：2020-01-29 15:54:46
解答
大米7袋和面粉4袋共重1640千克,3袋大米和面粉6袋共重1560千克则大米7x3袋和面粉4x3袋共重1640x3千克,3x2袋大米和面粉6x2袋共重1560x2千克每袋大米重(1640x3-1560x2)÷(7x3-3x2)=(4920-3120)÷(21-6)=1800÷15=120(千...
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