展开 sqrt(2)(sqrt(7)+10)

解答

展开

2 (7 + 10)

14 + 102

十进制

17.88379 \dots

求解步骤

2 (7 + 10)

使用分配律:

a (b + c) = ab + a c

2 (7 + 10) = 27 + 2 \cdot 10

= 27 + 2 \cdot 10

27 + 2 \cdot 10 = 14 + 102

= 14 + 102

e x p an d \frac{( x - 6 ) ( x - 2 )}{8 x ( 7 x - 6 )}

e x p an d - \frac{- 2 s ^{4} - 6 s ^{3} - 3 s ^{2} + 36 s + 54}{s ^{4} ( s + 3 ) ^{2}}

e x p an d t (t + d t + 4)

e x p an d \frac{d}{d x} ((2 x^{2} - 1) e^{- x^{2}}) + 5

f (x) = \frac{( 5 x ^{5} + 10 x ^{2} + 1 )}{( 1 - x ^{2} ) ^{5}}