2016-09-12
展开全部
12.8×4.6
=12.5×4.6+0.3×4.6
=12.5×4.8-12.5×0.2+0.3×4.6
=12.5×0.8×6-2.5+1.38
=10×6-1.12
=60-1.12
=58.88
=12.5×4.6+0.3×4.6
=12.5×4.8-12.5×0.2+0.3×4.6
=12.5×0.8×6-2.5+1.38
=10×6-1.12
=60-1.12
=58.88
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