3 × ( x + 1 ) + 4 × ( x - 1 ) + 60 = 66

Question

3  × ( x + 1 ) + 4  × ( x - 1 ) + 60 = 66

lanngocha · Answer

3 x (X + 1) + 4 x (X - 1) + 60 = 66   (3X + 3 x 1) + (4X - 4 x 1) = 66 - 60   (3X + 3) + (4X - 4) = 6   3X + 3 + 4X - 4 = 6   3X + 4X = 6 - 3 + 4   7X = 7   X = 7 : 7   X = 1   Vậy X = 1

thuminh · Answer

`3 &times; (x + 1) + 4 &times; (x - 1) + 60 = 66`   `3 &times; (x + 1) + 4 &times; (x - 1) = 66 - 60`   `3 &times; (x + 1) + 4 &times; (x - 1) = 6`   `(3 &times; x + 3 &times; 1) + (4 &times; x - 4 &times; 1) = 6`   `(3 &times; x + 3) + (4 &times; x - 4) = 6`   `3 &times; x + 3 + 4 &times; x - 4 = 6`   `3 &times; x + 4 &times; x - (4 - 3) = 6`   `x &times; (3 + 4) - 1 = 6`   `x &times; 7 = 6 + 1`   `x &times; 7 = 7`   `x = 7 : 7`   `x = 1`   Vậy `x = 1`

3 × ( x + 1 ) + 4 × ( x – 1 ) + 60 = 66

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