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uyen1612
2 năm trước
Giúp mình bài này với ạ !! Bài 1: a) (2x+3)^2 - 3(x-4)(x+4)=(x -2)^2 +1 b)(3x-2)(9x^2+6x+4) - (3x-1)(9x^2-3x+1)=x - 4 c)x ( x - 1) -(x - 3 )(x+4)=5x d)(2x+1)(2x-1)=4x(x-7)-3x
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