think

来源：学生作业帮助网编辑：作业帮时间：2024/04/30 14:44:03

think
think

think
2（t-1）²+t=1
2（t-1）²+t-1=0
(2t-1)(t-1)=0
t-1=0或2t-1=0
t1=1 t2=½

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