3|y|=0

解答

3 ∣ y ∣ = 0

y = 0

求解步骤

3 ∣ y ∣ = 0

两边除以

3

∣ y ∣ = 0

使用绝对值运算法则: 若

∣ u ∣ = 0

，则

u = 0

y = 0

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

x^{2} = 47

- 3.35179 \cdot \frac{t ^{2}}{2} + 4.1 t = 0

4 x - 1 \leq 5 x \leq 3 (x + 2)

(x + 9) (x - 3) = (x + 1)^{2}