39.5-(7.2 +9.5)用简便方法计算
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39.5-(7.2 +9.5)用简便方法计算
39.5-(7.2 +9.5)用简便方法计算
39.5-(7.2 +9.5)用简便方法计算
39.5-(7.2 +9.5)
=39.5-7.2-9.5
=(39.5-9.5)-7.2
=30-7.2
=22.8
39.5-(7.2 +9.5)用简便方法计算
39.5-(7.2 +9.5)用简便方法计算
39.5-(7.2 +9.5)用简便方法计算
39.5-(7.2 +9.5)
=39.5-7.2-9.5
=(39.5-9.5)-7.2
=30-7.2
=22.8