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25×0.75-(-25)×0.5+25×(-0.25)
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人气:160 ℃ 时间:2020-06-12 00:47:52
解答
25×0.75-(-25)×0.5+25×(-0.25)
=75X0.25+50X0.25-25X0.25
=100X0.25
=25
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