9.8=4.9t^2

解答

9.8 = 4.9 t^{2}

t = 2, t = - 2

十进制

t = 1.41421 \dots, t = - 1.41421 \dots

求解步骤

9.8 = 4.9 t^{2}

交换两边

4.9 t^{2} = 9.8

两边除以

4.9

t^{2} = 2

对于

x^{2} = f (a)

解为

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

t = 2, t = - 2

(n) = \frac{n ^{2}}{2} - 3 \frac{n}{2}

x^{2} - x + 1 = 0, x = 1 x = - 1

so l v e f or x, 2 x \cdot (6 x - 2 y^{2}) + 3 y^{2} (x - 4) = 8

x^{2} + (m - 1) x + 2 m - 6 = 0

so l v e f or x, x^{2} + y^{3} + 2 x - 8 y - 113 = 130