1a-1+1a+1-2aa2-1
=a+1+a-1-2a(a-1)(a+1)
=0(a+1)(a-1)
=0.
增加:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。
(∧)
删除:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。
(
\)
修改:在错的词下划一横线,在该行右边横线上写出改正后的词。
小题1:I asked him whether he will stay at home or go out that night.
小题2:I made up my mind to do my best to make a progress in English.
小题3:The boss got his workers entire in his power.
小题4:The teacher told us not make any noise then.
小题5:Her brother said he had been there half a month ago.