展开 5sqrt(5)(2-5sqrt(6))

解答

展开

55 (2 - 56)

105 - 2530

十进制

- 114.56995 \dots

求解步骤

55 (2 - 56)

使用分配律:

a (b - c) = ab - a c

55 (2 - 56) = 55 \cdot 2 - 55 \cdot 56

= 55 \cdot 2 - 55 \cdot 56

55 \cdot 2 - 55 \cdot 56 = 105 - 2530

= 105 - 2530

e x p an d \frac{36 x}{( x + 3 ) ^{2}}

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

e x p an d 7 (ln (x^{2} - 4) + \frac{2 x ^{2}}{x ^{2} - 4})

s im pl i f y (x + 6 - x) (x + 6 + x)

e x p an d - \frac{- y ^{2} + x ^{2}}{2 y ( x ^{4} + y ^{4} + x + 2 x ^{2} y ^{2} )}