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1994.4×3.6+2006.9×6.4简算
人气：277 ℃　时间：2020-04-08 22:17:10
解答
=1994.4X(3.6+6.4)+(2006.9-1994.4)X6.4
=1994.4X10+12.5X6.4
=19944+12.5X8X0.8
=19944+100X0.8
=19944+80
=20024
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