把下列各式分解因式:(1)x 4 -7x 2 +1;(2)x 4 +x 2 +2ax+1-a 2 (3)(1+y) 2 -2x 2 (1-y 2 )+x
把下列各式分解因式:(1)x4-7x2+1;(2)x4+x2+2ax+1-a2(3)(1+y)2-2x2(1-y2)+x4(1-y)2(4)x4+2x3+3x2+2x+1...
把下列各式分解因式:(1)x 4 -7x 2 +1;(2)x 4 +x 2 +2ax+1-a 2 (3)(1+y) 2 -2x 2 (1-y 2 )+x 4 (1-y) 2 (4)x 4 +2x 3 +3x 2 +2x+1.
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(1)x 4 -7x 2 +1 =x 4 +2x 2 +1-9x 2 =(x 2 +1) 2 -(3x) 2 =(x 2 +3x+1)(x 2 -3x+1); (2)x 4 +x 2 +2ax+1-a 2 =x 4 +2x 2 +1-x 2 +2ax-a 2 =(x 2 +1)-(x-a) 2 =(x 2 +1+x-a)(x 2 +1-x+a); (3)(1+y) 2 -2x 2 (1-y 2 )+x 4 (1-y) 2 =(1+y) 2 -2x 2 (1-y)(1+y)+x 4 (1-y) 2 =(1+y) 2 -2x 2 (1-y)(1+y)+[x 2 (1-y)] 2 =[(1+y)-x 2 (1-y)] 2 =(1+y-x 2 +x 2 y) 2 (4)x 4 +2x 3 +3x 2 +2x+1 =x 4 +x 3 +x 2 +x 3 +x 2 +x+x 2 +x+1 =x 2 (x 2 +x+1)+x(x 2 +x+1)+x 2 +x+1 =(x 2 +x+1) 2 . |
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