把下列各式分解因式:①a 2 -144b 2 ②πR 2 -πr 2 ③-x 4 +x 2 y 2
①a 2 -144b 2 , =a 2 -(12b) 2 , =(a+12b)(a-12b); ②πR 2 -πr 2 , =π(R 2 -r 2 ), =π(R+r)(R-r); ③-x 4 +x 2 y 2 , =-x 2 (x 2 -y 2 ), =-x 2 (x+y)(x-y). |
把下列各式分解因式.(1)9a2-14b2(3)12a2?ab+12b2(3)a2-2ab-4+b2(4...
ab+12b2=12(a2-2ab+b2)=12(a-b)2;(3)a2-2ab-4+b2=(a-b)2-4=(a-b+2)(a-b-2);(4)x(x2+1)2-4x3=x[(x2+1)2-4x2]=x(x2+1+2x)(x2+1-2x)=x(x+1)2(x-1)2;(5)x2-7x-8=(x-8)(x+1);(6)x(x-y)2+y(y-x)=(x...
5.把下列各式分解因式: (1)a2-14ab+49b2 (2)a(x+y)-(a-b)(x+y);(3...
a2-14ab+49b2 =(a-7b)²a(x+y)-(a-b)(x+y)=(x+y)(a-a+b)=b(x+y)121x2-144y2 =(11x)²-(12y)²=(11x+12y)(11x-12y)3x4-12x2 =3x²(x²-4)=3x²(x+2)(x-2)很高兴为您解答,祝你学习进步!【the1900】团队为您答题。有不...
跪求关于初中因式分解的题目(类型进来看)
4.若x2+mx+n能分解成( x+2 ) (x – 5),则m= ,n= ; 5.若二次三项式2x2+x+5m在实数范围内能因式分解,则m= ; 6.若x2+kx-6有一个因式是(x-2),则k的值是 ; 7.把下列因式因式分解: (1)a3-a2-2a (2)4m2-9n2-4m+1 (3)3a2+bc-3ac-ab (4)9-x2+2xy-y2 8.在实数范围内...
初二数学因式分解习题
证明一:原式=(x2+5x+4)(x2+5x+6)+1 =(x2+5x)2+10(x2+5x)+25 =(x2+5x+5)2 ∴原命题成立 证明二:原式=[(x+1)(x+4)][(x+2)(x+3)]+1 =(x2+5x+4)(x2+5x+6)+1 令a=x2+5x+4,则x2+5x+6=a+2 原式=a(a+2)+1=(a+1)2 即(x+1)(x+2)(x+3)(x+4)+1=...
把下列各式分解因式:(1)a2(x-y)2+2a(x-y)3+(x-y)4(2)(x2+y2)2-4x2y2
(1)a2(x-y)2+2a(x-y)3+(x-y)4,=(x-y)2[a2+2a(x-y)+(x-y)2,=(x-y)2(a+x-y)2;(2)(x2+y2)2-4x2y2,=(x2+2xy+y2)(x2-2xy+y2),=(x+y)2(x-y)2.
帮我出一道关于因式分解的题目
6.若x2+kx-6有一个因式是(x-2),则k的值是 ;7.把下列因式因式分解:(1)a3-a2-2a (2)4m2-9n2-4m+1 (3)3a2+bc-3ac-ab (4)9-x2+2xy-y2 8.在实数范围内因式分解:(1)2x2-3x-1 (2)-2x2+5xy+2y2 考点训练:1. 分解下列因式:(1).10a(x-y)2-5b(y...
把下列各式分解因式:(1)m2(x-y)+n2(y-x)(2)ab3-4ab2+4ab
(1)原式=m2(x-y)-n2(x-y),=(x-y)(m2-n2),=(x-y)(m+n)(m-n);(2)原式=ab(b2-4b+4),=ab(b-2)2.故答案为:(x-y)(m+n)(m-n);ab(b-2)2.
把下列各式进行因式分解ax2一4a2x十4a3
ax²-4a²x+4a³=a(x²-4ax+4a²)=a(x-2a)²
将下列各式分解因式:(3)-15m⊃3;n⊃2;-21mn⊃2;+42m⊃2;n...
(3)-3mn²(5m²-14m+7)(4)x² (x² +x+1)
把下列各式分解因式:(1)、x^2+xy (2)、ax^2-4ax+4a (3)、x^4-16y^4...
x^2+xy =x(x+y)ax^2-4ax+4a =a(x^2-4x+4)=a(x-2)^2 x^4-16y^4=(x^2+4y^2)(x^2-4y^2)=(x^2+4y^2)(x+2y)(x-2y)(x-1)^2-9=(x-1+3)(x-1-3)=(x+2)(x-4)(2a-b)^2+8ab =4a^2-4ab+b^2+8ab=4a^2+4ab+b^2=(2a+b)^2 9(a-b)^2-...