|x+7|=-(x-7)

解答

∣ x + 7 ∣ = - (x - 7)

x = 0

求解步骤

∣ x + 7 ∣ = - (x - 7)

找到正负区间

x < - 7, x \geq - 7

对每个区间解不等式

无解 or x = 0

x = 0

f a c t or - x^{2} + 4 x - 3

4 (x - 10)^{2} = 36

so l v e f or y, y x^{2} - 2 x^{3} = 36

s im pl i f y 5 (\frac{1}{3})^{3}

s im pl i f y (2 m - 3 + 7 m^{2}) - (3 - 9 m^{2} - 2 m)