展开 (x-1)(x^2-2/19 x-17/19)

解答

展开

(x - 1) (x^{2} - \frac{2}{19} x - \frac{17}{19})

x^{3} - \frac{21 x ^{2}}{19} - \frac{15 x}{19} + \frac{17}{19}

求解步骤

(x - 1) (x^{2} - \frac{2}{19} x - \frac{17}{19})

打开括号

= x x^{2} + x (- \frac{2}{19} x) + x (- \frac{17}{19}) - 1 \cdot x^{2} - 1 \cdot (- \frac{2}{19} x) - 1 \cdot (- \frac{17}{19})

化简

x x^{2} + x (- \frac{2}{19} x) + x (- \frac{17}{19}) - 1 \cdot x^{2} - 1 \cdot (- \frac{2}{19} x) - 1 \cdot (- \frac{17}{19}) : x^{3} - \frac{21 x ^{2}}{19} - \frac{15 x}{19} + \frac{17}{19}

= x^{3} - \frac{21 x ^{2}}{19} - \frac{15 x}{19} + \frac{17}{19}

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

e x p an d 56 + 32

e x p an d (sec^{2} (x - y)) (1 - \frac{d y}{d x})

e x p an d (tan (x) - 1) (sec (x) - 1)

e x p an d \frac{m \cdot Y}{s q ( G s t \cdot a + b ) b}