2(b+d)+10d10p/2-3p

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2(b+d)+10d10p/2-3p2(b+d)+10d10p/2-3p2(b+d)+10d10p/2-3p2(b+d)+10d=2b+2d+10d=2b+(2d+10d)=2b+12d10p/2-3

2(b+d)+10d10p/2-3p
2(b+d)+10d
10p/2-3p

2(b+d)+10d10p/2-3p
2(b+d)+10d
=2b+2d+10d
=2b+(2d+10d)
=2b+12d
10p/2-3p
=5p-3p
=2p
尹老师留