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Nguyễn Dung Hà
Giới thiệu về bản thân
Xin chào các bạn các bạn có thể kết bạn đc ko chứ mk chẳng có bạn, tại vì mk chẳng có ai đồng ý kết bạn hết
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0
2022-03-01 20:48:23
Ta có: f(1) = a.12 + b.1 + c = a + b + c
f(-1) = a.(-1)2 + b.(-1) + c = a - b + c
=> f(1) = f(-1) => a + b + c = a - b + c
=> a + b = a - b => a + b - a + b = 0
=> 2b = 0 => b = 0
Khi đó, ta có: f(-x) = a.(-x)2 + b.(-x) + c = ax2 - 0 . x + c = ax2 + c
f(x) = ax2 + bx + c = ax2 + 0.x + c = ax2 + c
=> f(-x) = f(x)
nha bạn
2022-03-01 20:29:05
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