(1):a(a²-a-1)+1(2):ab(m²+n²)+mn(a²+b²)(3):已知x-2y=-2b=-4098,求2bx²-8bxy+8by²-8b的值对(1)(2)作因式分解,
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(1):a(a²-a-1)+1(2):ab(m²+n²)+mn(a²+b²)(3):已知x-2y=-2b=-4098,求2bx²-8bxy+8by²-8b的值对(1)(2)作因式分解,
(1):a(a²-a-1)+1
(2):ab(m²+n²)+mn(a²+b²)
(3):已知x-2y=-2b=-4098,求2bx²-8bxy+8by²-8b的值
对(1)(2)作因式分解,
(1):a(a²-a-1)+1(2):ab(m²+n²)+mn(a²+b²)(3):已知x-2y=-2b=-4098,求2bx²-8bxy+8by²-8b的值对(1)(2)作因式分解,
(1)a(a²-a-1)+1=a(a²-a)-a+1=a²(a-1)-(a-1)=(a²-1)(a-1)=(a-1)²(a+1)
(2)ab(m²+n²)+mn(a²+b²)=abm²+a²mn+abn²+b²mn=am(bm+an)+bn(an+bm)
=(am+bn)(an+bm)
(3)2bx²-8bxy+8by²-8b=2b(x²-4xy+4y²)-8b=2b(x-2y)²-8b=4098*(-4098)²+4*(-4098)
=68820189192-16392=68820172800
前两题是什么题?
3、将问题因式分解,2b(x-2y)*(x-2y)-8b