题抄错了,应该是20-19+18-17+16-15+14-.+2-1=?
=1+1+1.+1 共10个
=10
20-19+18-17+16-15+14-.-2+1=?
20-19+18-17+16-15+14-.-2+1=?
数学人气:491 ℃时间:2019-10-22 11:19:18
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