3/4×3/4+1/4×0.75%-75%
=3/4x3/4+1/4x3/4-3/4
=(3/4+1/4-1)x3/4
=0x3/4
=0
如果本题有什么不明白可以追问,0.75％怎么能化成3/4你抄错了吧没有错，题就是这样的那个0.75% 应该是0.75吧