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y=a(x-m+2)(x-m-2)=a(x-m)2-4a.
人气:276 ℃ 时间:2020-08-24 21:45:43
解答
y
=a(x-m+2)(x-m-2)
=a[(x-m)+2][(x-m)-2]
=a[(x-m)²-4]
=a(x-m)²-4a
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