化简 (3x^2+7x^4)*(5x^1-7+8x^4+9)

解答

化简

(3 x^{2} + 7 x^{4}) \cdot (5 x^{1} - 7 + 8 x^{4} + 9)

(3 x^{2} + 7 x^{4}) (8 x^{4} + 5 x + 2)

求解步骤

(3 x^{2} + 7 x^{4}) (5 x^{1} - 7 + 8 x^{4} + 9)

对同类项分组

= (3 x^{2} + 7 x^{4}) (8 x^{4} + 5 x^{1} - 7 + 9)

数字相加:

- 7 + 9 = 2

= (3 x^{2} + 7 x^{4}) (8 x^{4} + 5 x^{1} + 2)

使用指数法则:

a^{1} = a

x^{1} = x

= (3 x^{2} + 7 x^{4}) (8 x^{4} + 5 x + 2)

e x p an d (10 - 2 x)^{3}

s im pl i f y 729 + (x - 2)^{3}

f a c t or 8 n^{3} - 27 m^{3}

s im pl i f y \frac{1}{2 \cdot 2 ^{n - 1} \cdot { 2 ( 2 ^{n} - 1 ) + ( 2 ^{n - 1} - 1 ) \cdot 2 }}

s im pl i f y \frac{- 21 y ^{3}}{- 3 y ^{2}}