展开 sqrt(3)(3+sqrt(5))

解答

展开

3 (3 + 5)

33 + 15

十进制

9.06913 \dots

求解步骤

3 (3 + 5)

使用分配律:

a (b + c) = ab + a c

3 (3 + 5) = 3 \cdot 3 + 35

= 3 \cdot 3 + 35

3 \cdot 3 + 35 = 33 + 15

= 33 + 15

e x p an d \frac{5}{s ^{4} ( s ^{2} + 36 )}

e x p an d \frac{2 ( 8 + 19 )}{3}

e x p an d \frac{( s - 6 )}{( s + 2 ) ( s ^{2} + 9 )}

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

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