758²-258²用因式分解计算
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x^2-x+(1/4)=x^2-2*x*(1/2)+(1/2)^2=(x-1/2)^2
(2)3(a-b)²+6(b-a)=3(a-b)²-6(a-b)=3(a-b)[(a-b)-6]=3(a-b)(a-b-6)(4)x(x-y)²-y(y-x)²
3^2000+6*3^1999-3^2001=3*3^1999+6*3^1999-3^2*3^1999=3^1999*(3+6-3^2)=3^1999*0=0
x^3+x^2-8x=x(x^2+x-8)
(x-y)(x-y-12)+36=(x-y)*[(x-y)-12]+36=(x-y)^2-12*(x-y)+36错=[(x-y)-4]*[(x-y)-9]……十字相乘解=(x-y-4)(x-y-9)注
(1)(x²+1)²-4x²(2)(2x-y)²-2(2x-y)+1(3)(x+y)²-2(x²-y²)+(x-y)²(
一、选择题()1.下列多项式中何者含有2x+3的因式(1)2x3+3(2)4x2-9(3)6x2-11x+3(4)2x2+x+3()2.下列何者是2x2-11x-21的因式?(1)(x-6)(2)(x
以下应该够用的了!1.(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=[3a-b-2(a+3b)]^2=(a-7b)^22.(a+3)2-6(a+3)=(a+3)(a-3)3(x+1)2
2005²—2004×2006=2005^2-(2005-1)(2005+1)=2005^2-2005^2+1=1
(a+2)(a2+4)(a-2)-(a2+8)(a2-2)=(a2+4)(a2-4)-(a2+8)(a2-2)=(a^4-16)-(a^4+6a2-16)=-6a2
100-(3x+2y)²=[10+(3x+2y)][1--(3x+2y)]=(10+3x+2y)(10-3x-2y)(2x+1)²-x²=[(2x+1)+x][(2x+1
这两道题都可以用提取公因式法分解计算.2005+2005²-2005*2006=2005(1+2005-2006)=2005*0=058.4*1.4+18.6*58.4-20*58.4=58
758²-258²=(758+258)(758-258)=1016×500=508000先因式分解,用平方差公式a²-b²=(a+b)(a-b)
分解因式:(1)a²x²+4a²xy+4a²y²=a²(x²+4xy+4y²)=a²(x+2y)²(
p(1-p)^3(1p)^3-p^2(p-1)^2(1p)^3;=p[(1-p)(1p)]^3-p^2(p-1)^2(1p)^2(1p)=p[(1-p^
758二次方-258二次方=(758+258)(758-258)=1016×500=508000
原式=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4).(1-1/10)(1+1/10)=(1/2)[(3/2)(2/3)(4/3)(3/4)(5/4).(8/9)
我告诉你步骤1.约分,约掉ab2.分子提取2a3.约掉(2a-b)
1.x²-5xy+6y²=(x-2y)(x-3y)y²(3x-2)+(2-3x)=(y²-1)(3x-2)=(y+1)(y-1)(3x-2)(x²+2