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Math problem: the second volume of the second day of junior high school (Zheng Qi middle school examination paper)
Existence,
1:2+2t+8-2t+3t= 12？ 2: 2+2t+3t= 12
So t=2/3, so t=2.
Only three cases are considered: ∠B is 90, ∠P is 90 and ∠Q is 90.