几道平方差公式初一题(步骤)1.用平方差公式计算:(x-y+3)(x-y-3)2.用平方差公式计算:(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)3.用平方差公式计算:(1-[(2^2)分之一])(1-[(3^2)分之一])...(1-[(2006^2)分之
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![几道平方差公式初一题(步骤)1.用平方差公式计算:(x-y+3)(x-y-3)2.用平方差公式计算:(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)3.用平方差公式计算:(1-[(2^2)分之一])(1-[(3^2)分之一])...(1-[(2006^2)分之](/uploads/image/z/2995825-49-5.jpg?t=%E5%87%A0%E9%81%93%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E5%88%9D%E4%B8%80%E9%A2%98%EF%BC%88%E6%AD%A5%E9%AA%A4%EF%BC%891.%E7%94%A8%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%9A%28x-y%2B3%29%28x-y-3%292.%E7%94%A8%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%9A%282%2B1%EF%BC%89%EF%BC%882%5E2%2B1%29%282%5E4%2B1%29%282%5E8%2B1%29%282%5E16%2B1%293.%E7%94%A8%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E8%AE%A1%E7%AE%97%3A%281-%5B%EF%BC%882%5E2%29%E5%88%86%E4%B9%8B%E4%B8%80%5D%EF%BC%89%EF%BC%881-%5B%283%5E2%29%E5%88%86%E4%B9%8B%E4%B8%80%5D%EF%BC%89...%281-%5B%282006%5E2%29%E5%88%86%E4%B9%8B)
几道平方差公式初一题(步骤)1.用平方差公式计算:(x-y+3)(x-y-3)2.用平方差公式计算:(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)3.用平方差公式计算:(1-[(2^2)分之一])(1-[(3^2)分之一])...(1-[(2006^2)分之
几道平方差公式初一题(步骤)
1.用平方差公式计算:(x-y+3)(x-y-3)
2.用平方差公式计算:(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)
3.用平方差公式计算:(1-[(2^2)分之一])(1-[(3^2)分之一])...(1-[(2006^2)分之一])(1-[(2007^2)分之一])
4.用平方差公式计算:(2x+y-3)(2x+y+3)
几道平方差公式初一题(步骤)1.用平方差公式计算:(x-y+3)(x-y-3)2.用平方差公式计算:(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)3.用平方差公式计算:(1-[(2^2)分之一])(1-[(3^2)分之一])...(1-[(2006^2)分之
:(x-y+3)(x-y-3)
=(x-y)^2-3^2=x^2-2xy+y^2-9
:(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)
=(2-1)(2+1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)
=(2^2-1)(2^2+1)(2^4+1)(2^8+1)(2^16+1)
=(2^4-1)(2^4+1)(2^8+1)(2^16+1)
=.
=2^32-1
:(1-[(2^2)分之一])(1-[(3^2)分之一])...(1-[(2006^2)分之一])(1-[(1--[(2007^2)分之一])
=(1+1/2)(1-1/2)(1+1/3)(1-1/3).(1+1/2007)(1-1/2007)
=1/2*3/2*2/3*4/3*3/4*.2006/2007*2008/2007
=1/2*2008/2007
=1004/2007
:(2x+y-3)(2x+y+3)=(2x+y)^2-3^2=4x^2+4xy+y^2-9