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thanhngocnguyen161106
3 năm trước

Tính nhanh (4x+1)^2 + (4x-1)^2 -2(1-16x^2)

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taihop60
3 năm trước

Đáp án:

Giải thích các bước giải:

(4x+1)2+(4x−1)2−2(1−16x2)

=(4x+1)2+(4x−1)2+2(16x2−1)

=(4x+1)2+2(4x+1)(4x−1)+(4x−1)2

=[(4x+1)+(4x−1)]2

=(8x)2=64x2

nganna
3 năm trước

(4x+1)2+(4x−1)2−2(1−16x2)

=(4x+1)2+(4x−1)2+2(16x2−1)

=[(4x+1)2+(4x−1)2+2(4x−1)4x+1)]

=[(4x+1)+(4x−1)]2

=(8x)2

=64x2

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