简便方法70.1-9.9
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简便方法70.1-9.9
简便方法70.1-9.9
简便方法70.1-9.9
70.1-9.9
=70.1-(10-0.1)
=70.1-10+0.1
=60.1+0.1
=60.2
简便方法70.1-9.9
简便方法70.1-9.9
简便方法70.1-9.9
70.1-9.9
=70.1-(10-0.1)
=70.1-10+0.1
=60.1+0.1
=60.2