1.25*5.6+2.25*3.6
=1.25*(8*0.7)+2.25*(4*0.9)
=1.25*8*0.7+2.25*4*0.9
=10*0.7+9*0.9
=7+8.1
=15.1
1.25*5.6+2.25*3.6简便做法
4个回答
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