Môn Toán Lớp 8: Pt đa thức thành nt:a. 2x^2 + 4xy-x -2yb. y^2 +y +x- x^c. 2x^2 + 2020x + 2018

2 bình luận về “Môn Toán Lớp 8: Pt đa thức thành nt:a. 2x^2 + 4xy-x -2yb. y^2 +y +x- x^c. 2x^2 + 2020x + 2018”

1. a, 2x^2 + 4xy – x – 2y

   = 2x(x + 2y) – (x + 2y)

   = (x + 2y)(2x – 1)

   b, y^2 + y + x – x^2

   = (y – x)(y + x) + (y + x)

   = (y + x)(y – x + 1)

   c, 2x^2 + 2020x + 2018

   = 2x^2 + 2x + 2018x + 2018

   = 2x(x + 1) + 2018(x + 1)

   = (x + 1)(2x + 2018)

   = 2(x + 1)(x + 1009)

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   Trả lời
2. a,2x^2 +4xy-x-2y

   =2x(x+2y)-(x+2y)

   =(x+2y)(2x-1)

   b,y^2 +y +x – x^2

   =(y^2 -x^2) +(y+x)

   =(y-x)(y+x)+(y+x)

   =(y+x)(y-x+1)

   c,2x^2 +2020x+2018

   =2(x^2 +1010x+1009)

   =2(x^2 +x +1009x+1009)

   =2[x(x+1)+1009(x+1)]

   =2(x+1)(x+1009)

   Trả lời