先化简,再求值:a-2+a^2-1⼀a-1,其中a=3.(求过程)

2025-05-07 21:38:21
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回答1:

a-2+a^2-1/a-1
=(a-2)+(a+1)(a-1)/(a-1)
=(a-2)+(a+1)
=(3-2)+(3+1)
=1+4
=5