a, 2x + 27 = -11
=> 2x = -11 - 27
=> 2x = -38
=> x = -38 : 2
=> x = -19
vậy___
b, 3x + 26 = 6
=> 3x = 6 - 26
=> 3x = -20
=> x = -20/3
vậy___
c, \(x\div4\frac{1}{2}=2,5\)
\(\Rightarrow x\div4,5=2,5\)
\(\Rightarrow x=4,5\cdot2,5\)
\(\Rightarrow x=11,25\)
vậy___
\(\frac{3}{4x}=\frac{1}{2}\) đk: x khác 0
\(\Rightarrow\frac{3}{4x}=\frac{3}{6}\)
=> 4x = 6
=> x = 4/6 = 2/3
vậy___
a) 2x + 27 = -11
2x = -11 - 27 =-28
=> \(x=-\frac{28}{2}=-14\)
B) 3x + 26 = 6
3x = 6 - 26 = -20
\(x=-\frac{20}{3}\)
C) ko rõ đề
D) \(\frac{3}{4x}=\frac{1}{2}\)
\(3\cdot2=4x\)
6= 4x
=> x = \(\frac{6}{4}=\frac{3}{2}\)
hok tốt .
a) 2x + 27 = -11
=> 2x = -11 - 27
=> 2x = -38
=> x = -38 : 2
=> x = -19
b) 3x + 26 = 6
=> 3x = 6 - 26
=> 3x = -20
=> x = \(\frac{-20}{3}\)
c) x : \(4\frac{1}{2}\)= 2,5
=> x : \(\frac{9}{2}\)= \(\frac{5}{2}\)
=> x = \(\frac{5}{2}.\frac{9}{2}\)
=> x = \(\frac{45}{4}\)
d) \(\frac{3}{4}x=\frac{1}{2}\)
=> x = \(\frac{1}{2}:\frac{3}{4}\)
=> x = \(\frac{1}{2}.\frac{4}{3}\)
=> x = \(\frac{2}{3}\)
a ) 2x + 27 = - 11
2x = - 11 - 27
2x = - 38
x = ( - 38 ) : 2
x = - 19
Vậy x = - 17
b ) 3x + 26 = 6
3x = 6 - 26
3x = - 20
x = ( - 20 ) : 3
x = \(\frac{-20}{3}\)
a) 2x + 27 = -11
\(\Rightarrow\)2x = -11 - 27 = -38
\(\Rightarrow\)x = -38 : 2 = -19
vậy .........
a , 2x + 27 = - 11
2x = - 11 - 27
2x = - 38
x = - 38 : 2
x = - 19
b , 3x + 26 = 6
3x = 6 - 26
3x = 20
x = 20 : 3
x = 20 / 3
c , x : 4 / 1 / 2 = 2.5
x : 9/2 = 5/2
x = 5 /2 x 9 /2
x = 45/4
d , 3 / 4 x = 1/2
x = 1/2 : 3/4
x = 2/3