展开 sqrt(5)(sqrt(2)+9)

解答

展开

5 (2 + 9)

10 + 95

十进制

23.28688 \dots

求解步骤

5 (2 + 9)

使用分配律:

a (b + c) = ab + a c

5 (2 + 9) = 52 + 5 \cdot 9

= 52 + 5 \cdot 9

52 + 5 \cdot 9 = 10 + 95

= 10 + 95

e x p an d \frac{48 x ^{2} + 3 x + 18}{( 5 x ^{2} + x + 3 ) ( x - 3 )}

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

e x p an d (2 + 5) (3 - 11)

e x p an d - \frac{8 ( u + v ) ^{2} ( 2 u - v ) ^{2}}{243}

s im pl i f y (- 9 - r^{2} + 3)^{2}