(x^2)-(x^4)+12
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(x^2)-(x^4)+12
(x^2)-(x^4)+12
(x^2)-(x^4)+12
把X^2当成整体:
原式=-[(X^2)^2-X^2-12]
=-(X^2-4)(X^2+3)
=-(X+2)(X-2)(X^2+3).
通分:x+4/x^2-8x+15,x-5/x^2+x-12,x-3/x^2-x-20
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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