1樓:匿名使用者
(1)m(x-y)-n(baiy-x)=(dum+n)(
zhix-y);
(dao2)2x4-32=2(回x4-16)=2[(x2)2-42]=2(x2+4)(答x2-4)=2(x2+4)(x-2)(x+2);
(3)a3-a=a(a2-1)=a(a+1)(a-1);
(4)(x+y)2-2(x+y)+1=(x+y-1)2;
(5)11+x+x(1+x)=(1+x)+x(1+x)=(1+x)2;
21+x+x(1+x)+x(1+x)2=(1+x)+x(1+x)+x(1+x)2=(1+x)[1+x+x(1+x)]=(1+x)3;
31+x+x(1+x)+x(1+x)2+x(1+x)3=(1+x)4;
看等號左右的變化,即都是先提公因式,或再運用提公因式,或依次提公因式分解所得;等號右邊括號內的資料不變,2,3,4依次增大,故可推理出:
41+x+x(1+x)+x(1+x)2+...+x(1+x)2008=(1+x)2009.
把下列各式分解因式(1)12a3b2-9a2b+3ab;(2)9x2-4y2;(3)x2(x-y)+(y-x);(4)(x-1)2+10(x-
2樓:神馬
(1)12a3b2-9a2b+3ab=3ab(du4a2b-3a+1);
zhi(2)9x2-4y2=(3x+2y)(dao3x-2y);
(3)x2(x-y)+(y-x)
=(x2-1)(x-y)
=(x-y)(x+1)(x-1);
(4)(x-1)2+10(x-1)+25
=(x-1+5)2
=(x-4)2.
把下列各式因式分解:(1)ax2-16ay2(2)-2a3+12a2-18a(3)a2-2ab+b2-1(4)a2(x-y)-4b2(x-y)(5)
3樓:小米米米小米米
(1)ax2-16ay2=a(x+4y)(
duzhix-4y);(dao
專2)-2a3+12a2-18a=-2a(屬a2-6a+9)=-2a (a-3)2;(3)a2-2ab+b2-1=(a-b)2-1=(a-b+1)(a-b-1);(4)a2(x-y)-4b2(x-y)=(x-y)(a2-4b2)=(x-y) (a+2b)(a-2b);(5)(x+2)(x-6)+16=x2-4x+4=(x-2)2.
4樓:科比ai打鐵
(zhi1)ax2-16ay2=a(daox+4y)(內容x-4y);
(2)-2a3+12a2-18a
=-2a(a2-6a+9)
=-2a (a-3)2;
(3)a2-2ab+b2-1
=(a-b)2-1
=(a-b+1)(a-b-1);
(4)a2(x-y)-4b2(x-y)
=(x-y)(a2-4b2)
=(x-y) (a+2b)(a-2b);
(5)(x+2)(x-6)+16=x2-4x+4=(x-2)2.
把下列各式分解因式(1)9a2 14b2(3)12a2 a
1 9a2 1 4b2 3a 1 2b 3a 1 2b 3 12a ab 12b 12 a2 2ab b2 1 2 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 ...
把下列各式分解因式14a2bc8ab32b
zhi1 4a2bc 8ab 32b2 4b daoa2c 2a 8b 版 2 x a b 權b c y b a b c x a b b c y a b b c a b b c x y 3 x4 81,x2 9 x2 9 x2 9 x 3 x 3 4 a 4 ab b2 a 2 b 2 5 2x3 ...
把下列各式因式分解 (1)ax2 16ay2(2) 2a
1 ax2 16ay2 a x 4y duzhix 4y dao 專2 2a3 12a2 18a 2a 屬a2 6a 9 2a a 3 2 3 a2 2ab b2 1 a b 2 1 a b 1 a b 1 4 a2 x y 4b2 x y x y a2 4b2 x y a 2b a 2b 5 x ...