Bài 3:
a: 12,45-x+4,25=6,763
=>16,7-x=6,763
=>x=16,7-6,763=9,937
b: \(\left|\frac23+\frac13:x\right|-\frac56=2\frac13\)
=>\(\left|\frac13:x+\frac23\right|=\frac73+\frac56=\frac{14}{6}+\frac56=\frac{19}{6}\)
=>\(\left[\begin{array}{l}\frac13:x+\frac23=\frac{19}{6}\\ \frac13:x+\frac23=-\frac{19}{6}\end{array}\right.\Rightarrow\left[\begin{array}{l}\frac13:x=\frac{19}{6}-\frac23=\frac{19-4}{6}=\frac{15}{6}=\frac52\\ \frac13:x=-\frac{19}{6}-\frac23=\frac{-23}{6}\end{array}\right.\)
=>\(\left[\begin{array}{l}x=\frac13:\frac52=\frac13\cdot\frac25=\frac{2}{15}\\ x=\frac13:\frac{-23}{6}=\frac13\cdot\frac{-6}{23}=\frac{-2}{23}\end{array}\right.\)
Bài 1:
a: S
b: Đ
c: S
d: Đ
đ: Đ
e: S
