(a+b-2)(a-b+2)?

2018-09-24 11:34 pm

回答 (1)

2018-09-27 2:23 pm
Sol
(a+b-2)(a-b+2)
=[a+(b-2)]*[a-(b-2)]
=a^2-(b-2)^2
=a^2-(b^2-4b+4)
=a^2-b^2+4b-4


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