5.9+4.9-5.9+4.9简便计算
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=(5.9-5.9)+(4.9+4.9)
=4.9+4.9
=(5-0.1) +(5-0.1)
=(5+5)-0.1-0.1
=10-0.2
=9.8
=4.9+4.9
=(5-0.1) +(5-0.1)
=(5+5)-0.1-0.1
=10-0.2
=9.8
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