78.95减7.98怎么简算?着急ing..

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78.95减7.98怎么简算?着急ing..78.95减7.98怎么简算?着急ing..78.95减7.98怎么简算?着急ing..78.95-7.98=78.95-(8-0.02)=78.95-8+

78.95减7.98怎么简算?着急ing..
78.95减7.98怎么简算?
着急ing..

78.95减7.98怎么简算?着急ing..
78.95-7.98
=78.95-(8-0.02)
=78.95-8+0.02
=70.95+0.02
=70.97

78.95-7.98
都加0.02
78.97-8=70.97