2.9*0.65+3.1*65%
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2.9*0.65+3.1*65%2.9*0.65+3.1*65%2.9*0.65+3.1*65%2.9×0.65+3.1×65/100=2.9×0.65+3.1×0.65=0.65×(2.9+3.1)
2.9*0.65+3.1*65%
2.9*0.65+3.1*65%
2.9*0.65+3.1*65%
2.9×0.65+3.1×65/100
=2.9×0.65+3.1×0.65
=0.65×(2.9+3.1)
=0.65×6
=3.9
2.9*0.65+3.1*65% =2.9*0.65+3.1*0.65=0.65*(2.9+3.1)=0.65*6=3.9
2.9*0.65+3.1*65%
0.65×14+87×65%-65%
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