HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
Bài 1:
a,=3(x+y)−(x+y)2=(x+y)(3−x−y)b,=4x4+4x2y2+y4−9y4=(2x2+y2)2−9y4=(2x2+y2−3y2)(2x2+y2+3y2)=(2x2−2y2)(2x2+4y2)=4(x−y)(x+y)(x2+2y2)a,=3(x+y)−(x+y)2=(x+y)(3−x−y)b,=4x4+4x2y2+y4−9y4=(2x2+y2)2−9y4=(2x2+y2−3y2)(2x2+y2+3y2)=(2x2−2y2)(2x2+4y2)=4(x−y)(x+y)(x2+2y2)
Bài 2:
a,=27(x3−1729)=27(x−19)(x2+19x+181)b,=3x(x−y)−5(x−y)=(3x−5)(x−y)c,=x3+x2−x2−x−6x−6=(x+1)(x2−x−6)=(x+1)(x2−3x+2x−6)=(x+1)(x−3)(x+2)a,=27(x3−1729)=27(x−19)(x2+19x+181)b,=3x(x−y)−5(x−y)=(3x−5)(x−y)c,=x3+x2−x2−x−6x−6=(x+1)(x2−x−6)=(x+1)(x2−3x+2x−6)=(x+1)(x−3)(x+2)
Bài 3:
a,=(ay2−by2)−(4ay−4by)+(4a−4b)=(a−b)(y2−4y+4)=(a−b)(y−2)2b,=3(x2+16+8x−4y2)=3[(x+4)2−4y2]=3(x+2y+4)(x−2y+4)
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