|2x+1|=19

解答

∣ 2 x + 1 ∣ = 19

x = - 10 or x = 9

求解步骤

∣ 2 x + 1 ∣ = 19

使用绝对值运算法则: 若

∣ u ∣ = a, a > 0

，则

u = a

u = - a

2 x + 1 = - 19 or 2 x + 1 = 19

2 x + 1 = - 19 or 2 x + 1 = 19

x = - 10 or x = 9

d - 20 = 14

s im pl i f y \frac{( - 8.3 ) ^{8}}{( - 8.3 ) ^{7}} \cdot \frac{( - 8.3 ) ^{4}}{( - 8.3 ) ^{3}}

f a c t or j^{2} - 10 j + 24

s im pl i f y \frac{3}{8} + \frac{1}{8}

\frac{x ^{2}}{0.2} = \frac{1}{230000}