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12.8×0.86+0.72×8.6简算
人气:482 ℃ 时间:2020-04-06 14:21:51
解答
12.8×0.86+0.72×8.6
=1.28×8.6+0.72×8.6
=(1.28+0.72)X8.6
=2X8.6
=17.2
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