展开 x(2sqrt(x)-2x-4)

解答

展开

x (2 x - 2 x - 4)

2 x x - 2 x^{2} - 4 x

求解步骤

x (2 x - 2 x - 4)

使用分配律:

m (a + b + c) = ma + mb + m c

x (2 x - 2 x - 4) = x \cdot 2 x + x (- 2 x) + x (- 4)

= x \cdot 2 x + x (- 2 x) + x (- 4)

化简

x \cdot 2 x + x (- 2 x) + x (- 4) : 2 x x - 2 x^{2} - 4 x

= 2 x x - 2 x^{2} - 4 x

e x p an d \frac{( ( x + 1 ) ^{2} )}{x ^{2} - s - 6}

e x p an d \frac{( x - 1 ) ^{2} + 2 ( x - 1 ) x ^{\frac{1}{13}}}{13 x ^{\frac{12}{13}}}

e x p an d 4 (4 x ln (x) + 2 x)

e x p an d \frac{1486}{6}

s im pl i f y (cos^{2} (t)) (2 cos (t) - sin (t))