(x+3y)^2*(x-3y)^2 和 1995^2x2005^2 的计算. 过程要明确哈`. 急需`` thanks谢谢哦.
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(x+3y)^2*(x-3y)^2 和 1995^2x2005^2 的计算. 过程要明确哈`. 急需`` thanks谢谢哦.
(x+3y)^2*(x-3y)^2 和 1995^2x2005^2 的计算. 过程要明确哈`. 急需`` thanks
谢谢哦.
(x+3y)^2*(x-3y)^2 和 1995^2x2005^2 的计算. 过程要明确哈`. 急需`` thanks谢谢哦.
(x+3y)^2*(x-3y)^2 =[(x+3y)(x-3y)]^2=(x^2-9y^2)^2=x^4-18x^2y^2+81y^4
1995^2x2005^2=(1995*2005)^2=[(2000-5)(2000+5)]^2=方法如上
=(x+3y)(x-3y)*(x+3y)(x-3y)=(x^2-9y^2)^2=x^4+81y^4-18x^2y^2
=(1995*2005)^2=[(2000-5)*(2000+5)]^2=(2000^2-5^2)^2=4000000^2+25^2-2*4000000*25=16000000000625-200000000=15999800000625
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