a. \(\frac{3}{5}+x=\frac{5}{6}\)
=> \(x=\frac{5}{6}-\frac{3}{5}\)
=> \(x=\frac{7}{30}\)
b. \(\left(3\frac{1}{2}+2x\right).\frac{8}{3}=\frac{16}{3}\)
=> \(3\frac{1}{2}+2x=\frac{16}{3}:\frac{8}{3}=2\)
=> \(2x=2-3\frac{1}{2}=2-\frac{7}{2}=-\frac{3}{2}\)
=> \(x=-\frac{3}{2}:2\)
=> \(x=-\frac{3}{4}\)
c. \(\left(x.\frac{1}{4}\right)-\frac{1}{4}=2\)
=> \(x.\frac{1}{4}=2+\frac{1}{4}=\frac{9}{4}\)
=> \(x=\frac{9}{4}:\frac{1}{4}\)
=> \(x=9\)
d. \(|2x-4|-\frac{1}{2}=\frac{5}{7}\)
=> \(|2x-4|=\frac{5}{7}+\frac{1}{2}=\frac{17}{14}\)
=> \(2x-4=\frac{17}{14}\)hoặc \(2x-4=-\frac{17}{14}\)
=> \(x=\frac{73}{28}\)hoặc \(x=-\frac{1}{8}\)
a, \(\frac{3}{5}\)+ x=\(\frac{5}{6}\)
=>x=\(\frac{5}{6}\)-\(\frac{3}{5}\)=\(\frac{25}{30}\)-\(\frac{18}{30}\)
=> x=\(\frac{7}{30}\)
vậy x=7/30
b, \(\left(3\frac{1}{2}+2x\right)\).\(\frac{8}{3}\)=\(\frac{16}{3}\)
=>\(\left(\frac{7}{2}+2x\right)\).\(\frac{8}{3}\)=\(\frac{16}{3}\)
=> \(\frac{7}{2}\)+2x=\(\frac{16}{3}\):\(\frac{8}{3}\)=2
=>2x=2-\(\frac{7}{2}\)=\(\frac{-3}{2}\)
=> x=\(\frac{-3}{2}\):2
=> x=\(\frac{-3}{4}\)
vậy x=-3/4
c,\(\left(x.\frac{1}{4}\right)\)-\(\frac{1}{4}\)=2
=>x.\(\frac{1}{4}\)=\(\frac{9}{4}\)
=> x=9
vậy x=9
d,|2x-4|-\(\frac{1}{2}\)=\(\frac{5}{7}\)
=> |2x-4|=\(\frac{17}{14}\)
=>\(\orbr{\begin{cases}2x-4=\frac{17}{14}\\2x-4=\frac{-17}{14}\end{cases}}\)
+) 2x-4=\(\frac{17}{14}\)=>2x=\(\frac{73}{14}\)=>x= tự tính
+) 2x-4=\(\frac{-17}{14}\)=>2x=\(\frac{9}{14}\)=>x=tự tính
vậy x= kết quả tính đc ở trên ;x=kết quả tính đc ở trên
học tốt!!!
en dây lơp 3 nên chưa biêt
dung hoi n
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