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7.24×0.1+0.5×72.4+0.049×724.
人气:345 ℃ 时间:2020-04-06 03:24:58
解答
7.24×0.1+0.5×72.4+0.049×724
=7.24×0.1+5×7.24+4.9×7.24
=7.24×(0.1+5+4.9)
=7.24×10
=72.4
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