Mathematics
Senior High

なんでT>=-1と変形できるの教えてください

(2)x2-2x=t とおくとay+x よって また T t=x2-2x=(x-1)2_120≦x ① 02 2-1 ... y=t2+4t+5=(t+2)2+1= (D) SIE [2] [1] に J

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