Mathematics
Senior High
Resolved

なぜこのような解き方になるのでしょうか
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(1) x x²+2x+3 2 x²+3x+5 x 2x 3 + x+1 x x x (x+1)(x+2)+3 x+1 -(x+2+3)-(x+2+-+1)-3-31 = = 3(x+1)-3x x(x+1) 3 x(x+1)

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