利用平方差公式计算1.(x-1/2)(x^2+1/4)(x+1/2)2.(x^4+y^4)(x^2+y^2)(x+y)(x-y)3.(3a+b-2)(3a-b+2)4.100^2/(252^2-248^2)5.(1-1/2)(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)+1/2^166.(6a^2b-1)(6a^2+1)7.(1-2x)(1+2x)(1+4x^2)(1+16x^4)8.(a+b-c)(a-b+c)-a^2
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