因式分解,下列各题.因式分解(1)-27mn+9m² n-18mn(2)9x² -4y² (3)2x² -4x+2(4)x² -y² +2x+2y(5)ax² -bx² +bx-ax+a-b(6)x² -2x-8(7)3x² +2x-1(8)ma-mb+2a-2b(9)3x² -12x³ y+12xy² (10)a
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![因式分解,下列各题.因式分解(1)-27mn+9m² n-18mn(2)9x² -4y² (3)2x² -4x+2(4)x² -y² +2x+2y(5)ax² -bx² +bx-ax+a-b(6)x² -2x-8(7)3x² +2x-1(8)ma-mb+2a-2b(9)3x² -12x³ y+12xy² (10)a](/uploads/image/z/14305981-13-1.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%2C%E4%B8%8B%E5%88%97%E5%90%84%E9%A2%98.%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%281%29-27mn%2B9m%26%23178%3B+n-18mn%282%299x%26%23178%3B+-4y%26%23178%3B+%283%292x%26%23178%3B+-4x%2B2%284%29x%26%23178%3B+-y%26%23178%3B+%2B2x%2B2y%285%29ax%26%23178%3B+-bx%26%23178%3B+%2Bbx-ax%2Ba-b%286%29x%26%23178%3B+-2x-8%287%293x%26%23178%3B+%2B2x-1%288%29ma-mb%2B2a-2b%289%293x%26%23178%3B+-12x%26%23179%3B+y%2B12xy%26%23178%3B+%2810%29a%26%231)
因式分解,下列各题.因式分解(1)-27mn+9m² n-18mn(2)9x² -4y² (3)2x² -4x+2(4)x² -y² +2x+2y(5)ax² -bx² +bx-ax+a-b(6)x² -2x-8(7)3x² +2x-1(8)ma-mb+2a-2b(9)3x² -12x³ y+12xy² (10)a
因式分解,下列各题.
因式分解
(1)-27mn+9m² n-18mn
(2)9x² -4y²
(3)2x² -4x+2
(4)x² -y² +2x+2y
(5)ax² -bx² +bx-ax+a-b
(6)x² -2x-8
(7)3x² +2x-1
(8)ma-mb+2a-2b
(9)3x² -12x³ y+12xy²
(10)a² -2ab+b² -1
因式分解,下列各题.因式分解(1)-27mn+9m² n-18mn(2)9x² -4y² (3)2x² -4x+2(4)x² -y² +2x+2y(5)ax² -bx² +bx-ax+a-b(6)x² -2x-8(7)3x² +2x-1(8)ma-mb+2a-2b(9)3x² -12x³ y+12xy² (10)a
(1)-27mn+9m² n-18mn
=9m²n-45mn
=9mn(m-5)
(2)9x² -4y²
=(3x+2y)(3x-2y)
(3)2x² -4x+2
=2(x²-2x+1)
=2(x-1)²
(4)x² -y² +2x+2y
=(x+y)(x-y)+2(x+y)
=(x+y)(x-y+2)
(5)ax² -bx² +bx-ax+a-b
=x²(a-b)-x(a-b)+(a-b)
=(a-b)(x²-x+1)
(6)x² -2x-8
=(x+2)(x-4)
(7)3x² +2x-1
=(3x-1)(x+1)
(8)ma-mb+2a-2b
=m(a-b)+2(a-b)
=(a-b)(m+2)
(9)3x² -12x³ y+12xy²
=3x(x-4x²y+4y²)
本题可能有误
估计是:3x³-12x²y+12xy²=3x(x²-4xy+4y²)=3x(x-2y)²
(10)a² -2ab+b² -1
=(a-b)²-1
=(a-b+1)(a-b-1)
(1)-27mn+9m² n-18mn
=9m²n-45mn
=9mn(m-5)
(2)9x² -4y²
=(3x+2y)(3x-2y)
(3)2x² -4x+2
=2(x²-2x+1)
=2(x-1)²
(4)x² -y² +2x+2y
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(1)-27mn+9m² n-18mn
=9m²n-45mn
=9mn(m-5)
(2)9x² -4y²
=(3x+2y)(3x-2y)
(3)2x² -4x+2
=2(x²-2x+1)
=2(x-1)²
(4)x² -y² +2x+2y
=(x+y)(x-y)+2(x+y)
=(x+y)(x-y+2)
(5)ax² -bx² +bx-ax+a-b
=x²(a-b)-x(a-b)+(a-b)
=(a-b)(x²-x+1)
(6)x² -2x-8
=(x+2)(x-4)
(7)3x² +2x-1
=(3x-1)(x+1)
(8)ma-mb+2a-2b
=m(a-b)+2(a-b)
=(a-b)(m+2)
(9)3x² -12x³ y+12xy²
=3x(x-4x²y+4y²)
(10)a² -2ab+b² -1
=(a-b)²-1
=(a-b+1)(a-b-1)
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