2016-11-19
展开全部
72×2.7+7.2×27
=2x72x2.7
=36x4x(2.5+0.2)
=360+0.8x36
=360+36-7.2
=396-7.2
=386+2.8
=388.8
=2x72x2.7
=36x4x(2.5+0.2)
=360+0.8x36
=360+36-7.2
=396-7.2
=386+2.8
=388.8
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