|-3.5d|=15.4

解

∣ - 3.5 d ∣ = 15.4

d = - \frac{22}{5} or d = \frac{22}{5}

十進法表記

d = - 4.4, d = 4.4

解答ステップ

∣ - 3.5 d ∣ = 15.4

絶対規則を適用する:

∣ u ∣ = a, a > 0

の場合は

u = a

u = - a

- 3.5 d = - 15.4 or - 3.5 d = 15.4

- 3.5 d = - 15.4 or - 3.5 d = 15.4

d = - \frac{22}{5} or d = \frac{22}{5}