计算题(写过程)(1)(3x+4)(3x-4)-9(x-2)(x-3)(2)(1-2x)(1+2x)(1+4x²
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计算题(写过程)
(1)(3x+4)(3x-4)-9(x-2)(x-3)
(2)(1-2x)(1+2x)(1+4x²)
(3)(x+y-2)(x+y+2)
(1)(3x+4)(3x-4)-9(x-2)(x-3)
(2)(1-2x)(1+2x)(1+4x²)
(3)(x+y-2)(x+y+2)
![计算题(写过程)(1)(3x+4)(3x-4)-9(x-2)(x-3)(2)(1-2x)(1+2x)(1+4x²](/uploads/image/z/5606102-38-2.jpg?t=%E8%AE%A1%E7%AE%97%E9%A2%98%EF%BC%88%E5%86%99%E8%BF%87%E7%A8%8B%EF%BC%89%EF%BC%881%EF%BC%89%EF%BC%883x%2B4%EF%BC%89%283x-4%29-9%28x-2%29%28x-3%29%EF%BC%882%EF%BC%89%EF%BC%881-2x%EF%BC%89%281%2B2x%29%281%2B4x%26sup2)
(1)(3x+4)(3x-4)-9(x-2)(x-3)
=9x²-16-9(x²-5x+6)
=9x²-16-9x²+45x-54
=45x-70
(2)(1-2x)(1+2x)(1+4x²)
=(1-4x²)(1+4x²)
=1-16x^4
(3)(x+y-2)(x+y+2)
=[(x+y)-2][(x+y)+2]
=(x+y)²-2²
=x²+2xy+y²-4
=9x²-16-9(x²-5x+6)
=9x²-16-9x²+45x-54
=45x-70
(2)(1-2x)(1+2x)(1+4x²)
=(1-4x²)(1+4x²)
=1-16x^4
(3)(x+y-2)(x+y+2)
=[(x+y)-2][(x+y)+2]
=(x+y)²-2²
=x²+2xy+y²-4
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