a) x/7 = 6/21
x/7 = 2/7
=>x=2
b)2/3x -1/2=1/10
2/3x = 1/10+1/2
2/3x = 3/5
x=3/5:2/3
x=9/10
c)1/4+1/3 : x = -5
d)3x+17=2
đ)2/3x +1/4 =7/12
2x+3/10= 11/6 . 6/11
x : 4 1/3 = -2,5
a) x/7 = 6/21
x/7 = 2/7
=>x=2
b)2/3x -1/2=1/10
2/3x = 1/10+1/2
2/3x = 3/5
x=3/5:2/3
x=9/10
c)1/4+1/3 : x = -5
d)3x+17=2
đ)2/3x +1/4 =7/12
2x+3/10= 11/6 . 6/11
x : 4 1/3 = -2,5
a}x/7 = 6/21
x/7 = 2/7
=>x = 2
b} 2/3x - 1/2 = 1/10
2/3x = 1/10 + 1/2
2/3x = 3/5
x = 3/5 : 2/3
x = 9/10
c} 1/4 + 1/3 : x = -5
d} 3x + 17 = 2
đ} 2/3x + 1/4 = 7/12
2x + 3/10 = 11/6 . 6/11
x : 41/3 = -2,5
a)
\(\frac{x}{7}=\frac{6}{21}\)
\(x=\frac{6}{21}\cdot7\)
\(x=2\)
b)
\(\frac{2}{3}x-\frac{1}{2}=\frac{1}{10}\)
\(\frac{2}{3}x=\frac{1}{10}+\frac{1}{2}\)
\(\frac{2}{3}x=\frac{3}{5}\)
\(x=\frac{3}{5}:\frac{2}{3}\)
\(x=\frac{9}{10}\)
c)
\(\frac{1}{4}+\frac{1}{3}:x=-5\)
\(\frac{1}{3}:x=-5-\frac{1}{4}\)
\(\frac{1}{3}:x=-\frac{21}{4}\)
\(x=\frac{1}{3}:\frac{-21}{4}\)
\(x=\frac{4}{63}\)
d)
\(3x+17=2\)
\(3x=2-17\)
\(3x=-15\)
\(x=-15:3\)
\(x=-5\)
đ)
\(\frac{2}{3}x+\frac{1}{4}=\frac{7}{12}\)
\(\frac{2}{3}x=\frac{7}{12}-\frac{1}{4}\)
\(\frac{2}{3}x=\frac{1}{3}\)
\(x=\frac{1}{3}:\frac{2}{3}\)
\(x=\frac{1}{2}\)
e)
\(2x+\frac{3}{10}=\frac{11}{6}\cdot\frac{6}{11}\)
\(2x+\frac{3}{10}=1\)
\(2x=1-\frac{3}{10}\)
\(2x=\frac{7}{10}\)
\(x=\frac{7}{10}:2\)
\(x=\frac{7}{20}\)
ê)
\(x:4\frac{1}{3}=-2,5\)
\(x:\frac{13}{3}=-2,5\)
\(x=-2,5\cdot\frac{13}{3}\)
\(x=-\frac{65}{6}\)
K NHÉ!
2/3x+1/4=7/12 giúp mình với
