| ■No11759に返信(困ってますさんの記事) 1)a^2 + ab + b −1=(a^2-1)+(a+1)b=(a-1)(a+1)+(a+1)b=・・・ 2)ab − bc + b^2 −ac=(ab+b^2)-(b+a)c=b(a+b)-(a+b)c=・・・ 3) x^2 +2x −(y−1)(y−3)={x+(y-1)}(x-(y-3)}=・・・ 4)x^2 +(3y+1)x +(y+4)(2y−3)={x+( )}{x+( )} 5)x^2−2xy+y^2−x+y−2=(x-y)^2-(x-y)-2= 6)x~2ーXY−6y~2+3X+y+2=x^2-(y-3)x-(6y^2-y-2)=x^2-(y-3)x-(2y+1)(3y-2)=
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