展开 sqrt(7)(sqrt(2)-11)

解答

展开

7 (2 - 11)

14 - 117

十进制

- 25.36160 \dots

求解步骤

7 (2 - 11)

使用分配律:

a (b - c) = ab - a c

7 (2 - 11) = 72 - 7 \cdot 11

= 72 - 7 \cdot 11

72 - 7 \cdot 11 = 14 - 117

= 14 - 117

e x p an d (11 e - 10 f) (11 e + 10 f)

e x p an d 2 e (4 e + 3) - 3 e (e - 5)

e x p an d 2 + 38 - \frac{1}{2}

\frac{d}{d x} ((1 - \frac{1}{x ^{2}}) \times (2 + x))

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