Question

[Mèo con đáng yêu]

Giúp mình gấp nha các bạn!!!

a) |x| - 38/7|x| - 3/4=2|x|+(8/7)

b) 17/2 - |2x-3/4|=-7/4

Answer 1

[Mischievous Angel]

câu b = 195/112

Answer 2

[Thắng Nguyễn]

a)|x| - 38/7|x| - 3/4=2|x|+(8/7)

\(VP=\frac{2\left(7\left|x\right|+4\right)}{7}\)

\(\Leftrightarrow\frac{3.19}{2.7}=\frac{2\left(7\left|x\right|+4\right)}{7}\)

\(\Leftrightarrow x=\pm\frac{41}{28}\)

b)17/2 - |2x-3/4|=-7/4

\(\Leftrightarrow\left|2x-\frac{3}{4}\right|=\frac{17}{2}-\left(-\frac{7}{4}\right)\)

\(\Leftrightarrow\left|2x-\frac{3}{4}\right|=\frac{51}{4}\)

\(\Leftrightarrow2x-\frac{3}{4}=\pm\frac{51}{4}\)

• Với \(2x-\frac{3}{4}=\frac{51}{4}\)

\(\Leftrightarrow x=\frac{11}{2}\)

• Với \(2x-\frac{3}{4}=-\frac{51}{4}\)

\(\Leftrightarrow x=-\frac{19}{4}\)