4.27-1.27+0.73-2.28简便方法?
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4.27-1.27+0.73-2.28
=3+0.73-2.28
=3.73-(3-0.72)
=3.73-3+0.72
=0.73+0.72
=1.45
=3+0.73-2.28
=3.73-(3-0.72)
=3.73-3+0.72
=0.73+0.72
=1.45
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