展开 x(2sqrt(x)-2x)

解答

展开

x (2 x - 2 x)

2 x x - 2 x^{2}

求解步骤

x (2 x - 2 x)

使用分配律:

a (b - c) = ab - a c

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

= x \cdot 2 x - x \cdot 2 x

化简

x \cdot 2 x - x \cdot 2 x : 2 x x - 2 x^{2}

= 2 x x - 2 x^{2}

e x p an d 3 + x (13 + e^{14 x - 7})

e x p an d \frac{2 x}{( x ^{2} - 3 ) ^{2}}

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

e x p an d \frac{0.8 ( s - 1 )}{( s + 1 ) ( 0.3 s + 1 )}

e x p an d cos^{2} (A) (1 + 2 tan (A)) + sin^{2} (A)