2016-11-08 18:23发布
=3²-(x-2)²
=(3+x-2)(3-x+2)
=(x+1)(5-x)
9-(2-x)^2
=3²-(2-x)²
=(3+2-X)(3-2+X)
=(5-X)(1+X)
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=3²-(x-2)²
=(3+x-2)(3-x+2)
=(x+1)(5-x)
9-(2-x)^2
=3²-(2-x)²
=(3+2-X)(3-2+X)
=(5-X)(1+X)
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