Tìm X 3x(12x-4)-9x(4x-3)=30 4.(2-x)+x.(x+6)=x2 5(x²-1)+x(1-5x)=x-2

2 bình luận về “Tìm X 3x(12x-4)-9x(4x-3)=30 4.(2-x)+x.(x+6)=x2 5(x²-1)+x(1-5x)=x-2”

1. a)3x(12x-4)-9x(4x-3)=30

   =>36x^2-12x-36x^2+27x=30

   =>15x=30=>x=2

   b)4(2-x)+x(x+6)=x^2

   =>8-4x+x^2+6x-x^2=0

   =>2x+8=0

   =>2x=-8=>x=-4

   c)5(x^2-1)+x(1-5x)=x-2

   =>5x^2-5+x-5x^2-x=-2

   =>-5=-2

   Vô lý! =>x in ∅

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2. $Gửie$ 

   

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