展開する (3x^4+2x*y^2)^3

解

展開する

(3 x^{4} + 2 x \cdot y^{2})^{3}

27 x^{12} + 54 x^{9} y^{2} + 36 x^{6} y^{4} + 8 x^{3} y^{6}

解答ステップ

(3 x^{4} + 2 x y^{2})^{3}

完全立方式を適用する:

(a + b)^{3} = a^{3} + 3 a^{2} b + 3 a b^{2} + b^{3}

(3 x^{4} + 2 x y^{2})^{3} = (3 x^{4})^{3} + 3 (3 x^{4})^{2} \cdot 2 x y^{2} + 3 \cdot 3 x^{4} (2 x y^{2})^{2} + (2 x y^{2})^{3}

= (3 x^{4})^{3} + 3 (3 x^{4})^{2} \cdot 2 x y^{2} + 3 \cdot 3 x^{4} (2 x y^{2})^{2} + (2 x y^{2})^{3}

簡素化

(3 x^{4})^{3} + 3 (3 x^{4})^{2} \cdot 2 x y^{2} + 3 \cdot 3 x^{4} (2 x y^{2})^{2} + (2 x y^{2})^{3} : 27 x^{12} + 54 x^{9} y^{2} + 36 x^{6} y^{4} + 8 x^{3} y^{6}

= 27 x^{12} + 54 x^{9} y^{2} + 36 x^{6} y^{4} + 8 x^{3} y^{6}