问几道代数方面的数学题1.化简(1) (x-1)(x-4)-{(x+2)(x-5)-[(x+3)(x-4)-(x-1)(x+6)]}(2) (2x^2-6x+5))^2-(2x^2-6x+4)^2-(2x+3)^22.先化简,再求值(1) (x^2-xy+y^2)^2(x^2+xy+y^2)^2(x-y)^2(x+y)^2,其中x=2,y=1(2) (a+b)(a^4+b^4)(a-b)(a^2+
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