来自蔡倩华的问题
2(b+d)+10d10p/2-3p
2(b+d)+10d
10p/2-3p
1回答
2019-11-24 22:11
2(b+d)+10d10p/2-3p
2(b+d)+10d
10p/2-3p
2(b+d)+10d
=2b+2d+10d
=2b+(2d+10d)
=2b+12d
10p/2-3p
=5p-3p
=2p
尹老师留