作几个题 因式分解啥的x3-9x= 16x四次方-1= 2x2+4x+2= 2a-(a+b)(a-b)= 3a2b(2a-3b2)= (-1+2a)2= (a+b)2-(a-b)2= (x-2y+4)(x-2y-4)= -a2+81= ay2-2a2y+3= 9y3-2y=计
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![作几个题 因式分解啥的x3-9x= 16x四次方-1= 2x2+4x+2= 2a-(a+b)(a-b)= 3a2b(2a-3b2)= (-1+2a)2= (a+b)2-(a-b)2= (x-2y+4)(x-2y-4)= -a2+81= ay2-2a2y+3= 9y3-2y=计](/uploads/image/z/13644677-29-7.jpg?t=%E4%BD%9C%E5%87%A0%E4%B8%AA%E9%A2%98+%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%E5%95%A5%E7%9A%84x3-9x%3D++++++++++++++++++16x%E5%9B%9B%E6%AC%A1%E6%96%B9-1%3D++++++++++++++++2x2%EF%BC%8B4x%EF%BC%8B2%3D+++++++++++++++++2a-%28a%EF%BC%8Bb%29%28a%EF%BC%8Db%29%3D+++3a2b%282a%EF%BC%8D3b2%29%3D++++%28-1%EF%BC%8B2a%292%3D++++%28a%2Bb%292-%28a-b%292%3D+++%EF%BC%88x-2y%2B4%EF%BC%89%28x-2y-4%29%3D++++-a2%2B81%3D++ay2-2a2y%2B3%3D+++++++9y3-2y%3D%E8%AE%A1)
作几个题 因式分解啥的x3-9x= 16x四次方-1= 2x2+4x+2= 2a-(a+b)(a-b)= 3a2b(2a-3b2)= (-1+2a)2= (a+b)2-(a-b)2= (x-2y+4)(x-2y-4)= -a2+81= ay2-2a2y+3= 9y3-2y=计
作几个题 因式分解啥的
x3-9x= 16x四次方-1= 2x2+4x+2= 2a-(a+b)(a-b)=
3a2b(2a-3b2)= (-1+2a)2= (a+b)2-(a-b)2= (x-2y+4)(x-2y-4)= -a2+81=
ay2-2a2y+3= 9y3-2y=
计算(2-a)(a+2)+(-b-2)(2-b)的值,其中a=√2,b=2√2
作几个题 因式分解啥的x3-9x= 16x四次方-1= 2x2+4x+2= 2a-(a+b)(a-b)= 3a2b(2a-3b2)= (-1+2a)2= (a+b)2-(a-b)2= (x-2y+4)(x-2y-4)= -a2+81= ay2-2a2y+3= 9y3-2y=计
x3-9x=-6x 16x四次方-1=(4x²+1)(2X-1)(2X+1) 2x2+4x+2=2(x+1)²
2a-(a+b)(a-b)=b²-a²+2a
3a2b(2a-3b2)=6a³b-9a²b² (-1+2a)2=4a²-2a+1 (a+b)2-(a-b)2=2a²+2b²
(x-2y+4)(x-2y-4)=x²-4xy+4y²+16 -a2+81=(9-a)(9+a)
ay2-2a2y+3=题目有问题 9y3-2y=y(3y-√2)(3y+√2)
计算(2-a)(a+2)+(-b-2)(2-b)的值,其中a=√2,b=2√2
(2-a)(a+2)+(-b-2)(2-b)=b²-a²
带入ab的值得:原式=6