简便方法计算 98×102-99² = 因式分解 3x-12x³ = 2x²+2x+1/2 =(2x-1)(-3x+2)=(-2/3m+n)(-2/3m-n)=(-2/3x-3/2y)²=若(ax+b)(x+2)=x²-4,那a的b次方=
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![简便方法计算 98×102-99² = 因式分解 3x-12x³ = 2x²+2x+1/2 =(2x-1)(-3x+2)=(-2/3m+n)(-2/3m-n)=(-2/3x-3/2y)²=若(ax+b)(x+2)=x²-4,那a的b次方=](/uploads/image/z/65714-50-4.jpg?t=%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97+98%C3%97102-99%26%23178%3B+%3D+%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3+3x-12x%26%23179%3B+%3D+2x%26%23178%3B%2B2x%2B1%2F2+%3D%282x-1%29%28-3x%2B2%29%3D%EF%BC%88-2%2F3m%2Bn%29%28-2%2F3m-n%29%3D%28-2%2F3x-3%2F2y%29%26%23178%3B%3D%E8%8B%A5%EF%BC%88ax%2Bb%29%28x%2B2%29%3Dx%26%23178%3B-4%2C%E9%82%A3a%E7%9A%84b%E6%AC%A1%E6%96%B9%3D)
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简便方法计算 98×102-99² = 因式分解 3x-12x³ = 2x²+2x+1/2 =(2x-1)(-3x+2)=(-2/3m+n)(-2/3m-n)=(-2/3x-3/2y)²=若(ax+b)(x+2)=x²-4,那a的b次方=
简便方法计算 98×102-99² = 因式分解 3x-12x³ = 2x²+2x+1/2 =
(2x-1)(-3x+2)=
(-2/3m+n)(-2/3m-n)=
(-2/3x-3/2y)²=
若(ax+b)(x+2)=x²-4,那a的b次方=
简便方法计算 98×102-99² = 因式分解 3x-12x³ = 2x²+2x+1/2 =(2x-1)(-3x+2)=(-2/3m+n)(-2/3m-n)=(-2/3x-3/2y)²=若(ax+b)(x+2)=x²-4,那a的b次方=
第一个
98*102-99^2
=(99-1)*(99+3)-99^2
=99^2+2*99-3-99^2
=2*99-3
=195
第二个没看懂你的意思