\(5-4x=21\)
\(4x=5-21\)
\(4x=-16\)
\(x=\left(-16\right):4\)
\(x=-4\)
\(\frac{1}{4}x+\frac{1}{8}=\frac{1}{3}\)
\(\frac{1}{4}x=\frac{1}{3}-\frac{1}{8}\)
\(\frac{1}{4}x=\frac{5}{24}\)
\(x=\frac{5}{24}:\frac{1}{4}\)
\(x=\frac{5}{6}\)
Trả lời:
1/ 5-4.x=21
4.x=5-21
4.x=-16
x=-16:4
x=-4
Vạy x=-4
2/ \(\frac{1}{4}.x+\frac{1}{8}=\frac{1}{3}\)
\(\frac{1}{4}.x=\frac{1}{3}-\frac{1}{8}\)
\(\frac{1}{4}.x=\frac{5}{24}\)
\(x=\frac{5}{24}:\frac{1}{4}\)
\(x=\frac{5}{6}\)
Vậy x=\(\frac{5}{6}\)
