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a,
(2x-3)-(x-5)=(x+2)-(x-1)
2x-3-x+5=x+2-x+1
x+2=3
x=1
b,
2(x-1)-5(x+2)=-10
2x-2-5x+10=-10
-3x+8=-10
-3x=-18
x=6
a) ( 2x - 3 ) - ( x - 5 ) = ( x + 2 ) - ( x - 1 )
2x - 3 - x + 5 = x + 2 - x + 1
( 2x - x ) + ( 5 - 3 ) = ( x - x ) + ( 2 + 1 )
x + 2 = 3
x = 3 - 2
x = 1
b) 2( x - 1 ) - 5( x + 2 ) = -10
2x - 2.1 - 5x + 5.2 = -10
2x - 2 - 5x + 10 = -10
( 2x - 5x ) + ( 10 - 2 ) = -10
-3x + 8 = -10
-3x = -10 - 8
-3x = -18
x = -18 : -3
x = 6
a) (2x -3) - (x- 5) = (x +2 ) - (x - 1)
( 2x - 3) - (x - 5) - (x + 2) + (x - 1) =0
2x - 3 - x +5 - x - 2 + x - 1 =0
(2x - x - x + x) + (-3 + 5 - 1) = 0
x + 1 = 0
x = 0 - 1
x = -1
b) 2(x - 1) - 5(x + 2) = -10
2x - 2 - 5x + 10 = -10
(2x - 5x) + (-2 + 10) = -10
-3x + 8 = -10
-3x = -10 - 8
-3x = -18
x = -18 : (-3)
x = 6
k mình điiiiiii
a , (2x-3)-(x-5)=(x+2)-(x-1)
= 2x-3 -x+5 = x + 2-x+1
= x +2 = 3
=> x =2
\(\left(2x-3\right)-\left(x-5\right)=\left(x+2\right)-\left(x-1\right)\)
\(\Leftrightarrow2x-3-x+5=x+2-x+1\)
\(\Leftrightarrow2x-3-x+5-x-2+x-1=0\)
\(\Leftrightarrow x-1=0\)
\(\Leftrightarrow x=1\)
\(\left(3-\frac{9}{10}-\left|x+2\right|\right):\left(\frac{19}{10}-1-\frac{2}{5}\right)+\frac{4}{5}=1\)
\(\left(\frac{21}{10}-\left|x+2\right|\right):\frac{1}{2}+\frac{4}{5}=1\)
\(\left(\frac{21}{10}-\left|x+2\right|\right):\frac{1}{2}=\frac{1}{5}\)
\(\frac{21}{10}-\left|x+2\right|=\frac{1}{10}\)
=> |x+2| = 2
TH1: x + 2 = 2 => x = 0
TH2: x + 2 = -2 => x = -4
KL:...
a) đề kiểu gì vậy bạn
b) \(x+\frac{2}{14}=\frac{3}{21}\Leftrightarrow x=0\)
c) \(x+\frac{2}{7}=\frac{1}{2}\Leftrightarrow x=\frac{3}{14}\)
d) \(\frac{12}{15}=\frac{x-5}{10}\Leftrightarrow15x-75=120\Leftrightarrow15x=195\Leftrightarrow x=13\)
3(x - 2) + 2(x - 1) = 10
=> 3x - 3 . 2 + 2x - 2 . 1 = 10
=> 3x - 6 + 2x - 2 = 10
=> 3x + 2x = 10 + 6 + 2
=> 5x = 18
=> x = \(\frac{18}{5}=3,6\)
Vậy...........