题目内容
计算:
(1)(x+1)(x+2)(x+3);
(2)(1+2x)(1-2x)(x+3);
(3)(x+y-2)2.
(1)(x+1)(x+2)(x+3);
(2)(1+2x)(1-2x)(x+3);
(3)(x+y-2)2.
(1)原式=(x2+3x+2)(x+3)
=x3+6x2+11x+6;
(2)原式=(1-4x2)(x+3)
=-4x3-12x2+x+3;
(3)原式=(x+y)2-4(x+y)+4
=x2+y2+2xy-4x-4y+4.
=x3+6x2+11x+6;
(2)原式=(1-4x2)(x+3)
=-4x3-12x2+x+3;
(3)原式=(x+y)2-4(x+y)+4
=x2+y2+2xy-4x-4y+4.
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