展开 (y-2pi)^2

解答

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(y - 2 π)^{2}

y^{2} - 4 π y + 4 π^{2}

求解步骤

(y - 2 π)^{2}

使用完全平方公式:

(a - b)^{2} = a^{2} - 2 ab + b^{2}

a = y, b = 2 π

= y^{2} - 2 y \cdot 2 π + (2 π)^{2}

化简

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

= y^{2} - 4 π y + 4 π^{2}

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

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

e x p an d (3 D - 9 E + F = - 9, 0) - (- 9 D + E + F = - 82)

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

e x p an d \frac{1}{p ( p - k )}