|2x-5|=11

解答

∣ 2 x - 5 ∣ = 11

x = - 3 or x = 8

求解步骤

∣ 2 x - 5 ∣ = 11

使用绝对值运算法则: 若

∣ u ∣ = a, a > 0

，则

u = a

u = - a

2 x - 5 = - 11 or 2 x - 5 = 11

2 x - 5 = - 11 or 2 x - 5 = 11

x = - 3 or x = 8

2 (x - 8)^{2} + 40 = 16

3 x^{2} + 12 x - 6 = 0

f a c t or x^{5} + 6 x^{4} y + 9 x^{3} y^{2} + x^{2} y^{3} + 6 x y^{4} + 9 y^{5}

s im pl i f y \frac{11 + 3}{11 - 3}

2 x^{2} + 8 x + 77 = 0