展开 x(sqrt(2x)-7=1)

解答

展开

x (2 x - 7 = 1)

2 x x - 7 x = 1

求解步骤

x (2 x - 7 = 1)

= x (2 x - 7 \cdot 1 =)

使用分配律:

a (b - c) = ab - a c

a = x, b = 2 x, c = 7 = 1

x 2 x - x \cdot 7 = 1

x 2 x - 7 x = 1

乘开

x 2 x - 7 x : 2 x x - 7 x

2 x x - 7 x = 1

e x p an d (x - 3) e^{\frac{1}{x}}

e x p an d A (- 3, 2) B (7, - 3)

e x p an d 5 + 5 p + p + 5

e x p an d (3 x - 2) \cdot e^{x}

e x p an d y (5, - 2)