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0.8x33x1.25
7.2x9.9
人气:468 ℃ 时间:2020-08-25 00:21:14
解答
0.8x33x1.25
=4/5×5/4×33
=1×33
=33
7.2x9.9
=7.2×(10-0.1)
=7.2×10-7.2×0.1
=72-0.72
=71.28
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