化简:(a+1)(a-3)-(a-2) ^2
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化简:(a+1)(a-3)-(a-2) ^2
化简:(a+1)(a-3)-(a-2) ^2
化简:(a+1)(a-3)-(a-2) ^2
答:
(a+1)(a-3)-(a-2) ^2
=(a^2-3a+a-3)-(a^2-4a+4)
=a^2-2a-3-a^2+4a-4
=2a-7
(通分) a/a^a^a+3a+2 ,a/a^a+2a+1 ,-1/3a+6
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