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1、1/3 1.2.1.(a+b)a3+b3?(a-b)a3-b3?2.(1)(x3-l)(x6+x3+l)(x9+l):(2)(x+l)(x-l)(x2+x+l)(x2-x+1);(3)(x+2y)2(x2-2xy+4y2)2.(1)(m-5)(m2+5m+25):(2)(x+3)(x2+3x+9):(3)(2x2+7)(4x2-14x+49);(4)(3a+5)(9a2-l 5a+5)2/3 (1)=(x9-l)(x9+l)=xl8-l.=(x+1)(x-l)(x2+l)+x(x2+l)-x=(x2-l)(x2+l)2-x2=(x2-l)(x4+x2+l)=x6-l:(x+l)(x2-x+l)
2、(x-l)(x2+x+l)=(x3+l)(x3-l)=x6-l:(3)=(x+2y)(x2-2xy+4y2)2=(x3+8y3)2=x6+16x3y3+64y6 1.(1)(a+b)(a2-ab+b2)(a6-a3b3+b6):(2)(a+2)(a-2)(a2-2a+4)(a2+2a+4).2.(x-y)2(x2+xy+y2)2-(x3+y3)(-x3+y3),x=l,y=l 1.3/3 2.1.(1)(a+2)(a-2)(16+4a2+a4);(2)(x2-y2)(x2+xy+y2)(x2-xy+y2);2.(1)(a+2b)2-2abl (a-2b)2+2ab(a+2b)(a-2b);(2)(4t2-6t+9)(27+8t3)(3+2t);(3)(3x-2y)-3x(3x+2y)-4y2(27x3+8y3):(4)(bm-ani)(-a2m-ambm-b2m).1 2.