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...A.1+4x2=(1+2x)2B.6a-9-a2=-(a-3)2C.1+4m-4m2=(1-2m)2D.
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结果是( ) A.(x-y)4 B.(x2-y2)4 C.[(x+y)(x-y)]2 D.(x+y)2(x-y)2二、填空题5.已知9x2-6xy+k是完全平方式,则k的值是___
A.x2-6x-9 B.a2-16a+32 C.x2-2xy+4y2 D.4a2-4a+1 3.下列各式属于正确分解因式的是( ) A.1+4x2=(1+2x)2 B.6a-9-a2=-(a-3)2 C.1+4m-4m2=(1-2m)2 D.x2+xy+y2=(x+y)2 4.把x4-2x2y2+y4分解因式,结果是( ) A.(x-y)4 B.(x2-y2)4 C.[(x+y)(x-y)]2 D.(...
(1)a2-6a+9=(a-3)2;(2)x-4x3=x(1-4x2)=x(1+2x)(1-2x).
1、向量a垂直向量b,则:a*b=0 (y-1)(4^x+1)+(y-k)(2^x)=0 (4^x+2^x+1)y=4^x+k×2^x+1 y=(4^x+k×2^x+1)/(4^x+2^x+1)2、y=[(4^x+2^x+1)+(k-1)×2^x]/[4^x+2^x+1]y=1+[(k-1)×2^x]/[4^x+2^x+1] 【第二项的...
(1)3x-12x3=3x(1-4x2)=3x(1-2x)(1+2x); (2)-2a3+12a2-18a=-2a(a2-6a+9)=-2a(a-3)2;(3)(x+y)2+2(x+y)+1=(x+y+1)2.
8.a^2+2ab+b^2-2a-2b+1 9.a2+bc-3ac-ab 10.9-x2+2xy-y2 10.a^2-4ab+4b^2-a^3+4ab^2 在实数范围内因式分解:11.2x2-3x-1 12.-2x2+5xy+2y2 12.24a^2b^2-6(a^2+b^2)^2 分解下列因式:13.10a(x-y)2-5b(y-x) 14.an+1-4an+4an-1 14.xˇ2+...
(9).x5y-9xy5 (10).-4x2+3xy+2y2(11).4a-a5 (12).2x2-4x+1 (13).4y2+4y-5 (14)3X2-7X+2解题指导: 1.下列运算:(1) (a-3)2=a2-6a+9 (2) x-4=(x +2)( x -2) (3) ax2+a2xy+a=a(x2+ax) (4) 116 x2-14 x+14 =x2-4x+4=(x-2)2其中是因式分解,且运算正确...
如果A = 3x2 – 2x , B = 3x – 2 , 则下列各式中成立的是 ( A ) (A) A + B = 3x2 + x – 2 (B) A – B = 3x2 – x – 2 (C) B – A = 5x - 3x2 + 2 (D) A + 2B = 3x2 - 8x - 4 (2) 减3a 等于 9a2 - 3a + 8 的代数式是 ( A ) ; (A) 9a2 + ...