(x^2)/(2+2)=20

解答

\frac{x ^{2}}{2 + 2} = 20

x = 45, x = - 45

十进制

x = 8.94427 \dots, x = - 8.94427 \dots

求解步骤

\frac{x ^{2}}{2 + 2} = 20

在两边乘以

2 + 2

x^{2} = 80

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

x = 80, x = - 80

80 = 45

- 80 = - 45

x = 45, x = - 45

48 x^{2} - 13 x - 1 = 0

(k^{2} + 3) \cdot x^{2} + (k^{3} + k + 1) \cdot x + 2 k + 2 = 0

(a + b) 2 x^{2} + 6 (a^{2} - b^{2}) x + 9 (a - b) 2 = 0

x^{2} + (m - 1) x + (m + 2) = 0

so l v e f or a, 130 r^{2} - a^{2} r^{3} + a^{2} = 0