展开 (x-2)x(7sqrt(2)+7sqrt(x))

解答

展开

(x - 2) \cdot x \cdot (72 + 7 x)

72 x^{2} + 7 x^{2} x - 142 x - 14 x x

求解步骤

(x - 2) x (72 + 7 x)

= x (x - 2) (72 + 7 x)

Apply FOIL method

(x - 2) (72 + 7 x) : 72 x + 7 x x - 142 - 14 x

= x (72 x + 7 x x - 142 - 14 x)

打开括号

= x \cdot 72 x + x \cdot 7 x x + x (- 142) + x (- 14 x)

化简

x \cdot 72 x + x \cdot 7 x x + x (- 142) + x (- 14 x) : 72 x^{2} + 7 x^{2} x - 142 x - 14 x x

= 72 x^{2} + 7 x^{2} x - 142 x - 14 x x

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e x p an d Δ (3 x - 2)

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