五袋大米以每袋50千克为准,超过的记为正,不足的记为负,称重记录如下:+4.5,-4,+2.3,-3.5,+2.5,这五袋大米共超过______千克,总重量是______千克.
4.5+(-4)+2.3+(-3.5)+2.5
=0.5+2.3-3.5+2.5
=1.8(千克);
50×5+1.8=251.8(千克).
故答案为:1.8,251.8.
=0.5+2.3-3.5+2.5
=1.8(千克);
50×5+1.8=251.8(千克).
故答案为:1.8,251.8.
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