因式分解，要过程
\u51e0\u9053\u56e0\u5f0f\u5206\u89e3\uff0c\u8981\u8fc7\u7a0b1\uff09-x\u7684\u5e73\u65b9+2x+8
=-(x^2-2x-8)
=-(x-4)(x+2)
\uff082\uff09a\u7684\u5e73\u65b9-b\u7684\u5e73\u65b9+2bc-c\u7684\u5e73\u65b9
=a^2-(b^2-2bc+c^2)
=a^2-(b-c)^2
=(a-b+c)(a+b-c)
\uff083\uff09x\u7684\u5e73\u65b9+6xy+8y\u7684\u5e73\u65b9
=(x+2y)(x+4y)
\uff084\uff09m\u7684\u5e73\u65b9+2mn-15n\u7684\u5e73\u65b9
=(m-3n)(m+5n)
(5 )\uff08a-b\uff09\u7684\u5e73\u65b9-\uff08a-b\uff09\u7684\u5e73\u65b9-2
=(a-b-2)(a-b+1)
\uff086\uff09\uff08a+b\uff09\u7684\u5e73\u65b9+\uff08a+b\uff09-6
=(a+b+3)(a+b-2)
\uff087\uff09a\u7684\u5e73\u65b9-2ab+b\u7684\u5e73\u65b9-1
=(a-b)^2-1
=(a-b+1)(a-b-1)
原式=X^2-6X +8+1
=x^2-6x+9
=(X-3)^2
^2表示平方
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