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3行目で、なぜ⭕️した-1を要にしようと思えるのでしょうか、1×1成分の1を要にしたくなりませんか？

;1|1 0 0 0 1 2, (1 -14|0 0 10 -7 1000 0 100 0 0 0100 -5|0 0 10 Qに) 3 2 3 -1 -1 4 0001 三 I C3 - C ×3, -1 7 00 0 1 0 0 1 0 0 1 0 0 1 -3 0 0 1 (1 0(1 0 -7|1 -2 00 0 0 Pal-2) 1 00 Pzl-3) Peり 2 0 -14 |0 Ti- r2 × 2, r3- T2 × 3, r4 + T2、 -3(1 0 0 100 1 -1 0 7 1 0 0 0 1 -3 0 0 1 0 0 1 -2 0 0 0 1 -1 0 1 Qa(7) 0 0 0 1 00 0 0 0 00 0 -3 1 0 Pos(1) Pat2) 2 0 0 0 0 0 0 -1 12 C3 + C ×7, -1) 0 0 7 0 0 1 1 『i+r4, T3 +r4 ×2、 -1.0 0 0 1 0 1 1 7 0 1 -3 0 -3 0 0 1 1 -1 0. 0(1 0 0 1 01 0 0 -1 0 -1 0 0 1 00 0(1 0 0 1 0 0 Pi-Ps P.1-) 0 -101 1× (-1)、0 0 0 0 0 0 -1 12 0 0 0 -1 1 2 R|P Q 0 0 0 1 0 1 -1 0 1 1→ T4, 1 ニ 0 7 11 0 7 0 1 -3 0 1 -3 0 0 1 00 1 0100|010 102T100

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