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\(a)\) \(2x-5=21\)
\(\Leftrightarrow\) \(2x=21+5\)
\(\Leftrightarrow\) \(2x=26\)
\(\Leftrightarrow\) \(x=26:2\)
\(\Leftrightarrow\) \(=13\)
\(b)\) \(\frac{3}{4}+\frac{1}{4}x=\frac{5}{6}\)
\(\Leftrightarrow\) \(\frac{1}{4}x=\frac{5}{6}-\frac{3}{4}\)
\(\Leftrightarrow\) \(\frac{1}{4}x=\frac{1}{12}\)
\(\Leftrightarrow\) \(x=\frac{1}{3}\)
7/12:(2xX+1)=-5
2xX+1=-5x7/2=35/12
2xX=35/12-1=23/12
X=23/12:2=23/24
VẬY X=23/24
1/4+1/3:(2×X+1)=-5
7/12:(2×X+1)=-5
2×X+1=-5×7/12
2×X+1=-35/12
2×X=-35/12-1
2×X=-47/12
X=-47/12:2
X=47/24
Vậy X bằng 47/24
Chúc bạn học tốt
2xX+X:0,125=10
2xX+Xx1/8=10
Xx(2+1/8)=10
Xx2,125=10
X=10:2,125
X=80/17
`1/2 xx x +3/2 =7`
`=> 1/2 xx x = 7-3/2`
`=> 1/2 xx x = 14/2 -3/2`
`=> 1/2 xx x = 11/2`
`=> x= 11/2 :1/2`
`=> x=11/2 xx2`
`=> x= 22/2`
`=>x=11`
Vậy `x=11`
__
`3/2 xx x -2/7 xx(x-7/2)=18`
`=> 3/2 xx x -2/7x + 1=18`
`=> (3/2 -2/7 )x+ 1 =18`
`=> 17/14 x=18-1`
`=> 17/14x=17`
`=>x=17:17/14`
`=> x=17 xx 14/17`
`=>x=14`
a) \(\dfrac{1}{2}\times x+\dfrac{3}{2}=7\)
\(\dfrac{1}{2}\times x=7-\dfrac{3}{2}\)
\(\dfrac{1}{2}\times x=\dfrac{11}{2}\)
\(x=\dfrac{11}{2}\div\dfrac{1}{2}\\ x=\dfrac{11}{2}\times2\\ x=\dfrac{22}{2}=11\)
b) \(\dfrac{3}{2}\times x-\dfrac{2}{7}\times\left(x-\dfrac{7}{2}\right)=18\)
\(\dfrac{3}{2}\times x-\left(\dfrac{2}{7}x-1\right)=18\)
\(\dfrac{3}{2}\times x-\dfrac{2}{7}x+1=18\)
\(\dfrac{3}{2}x-\dfrac{2}{7}x+1=18\)
\(\dfrac{17}{14}x+1=18\)
\(\dfrac{17}{14}x=18-1\)
\(\dfrac{17}{14}x=17\)
\(x=17\div\dfrac{17}{14}\)
\(x=17\times\dfrac{14}{17}\)
\(x=14\)
\(\left(2\cdot x-3\right)\cdot3-5=10\)
\(\left(2x-3\right)\cdot3=15\)
\(2x-3=5\)
\(2x=8\)
\(x=4\)
\(\left(2\times x-3\right):3-5=10\)
\(\left(2\times x-3\right)\times3=10+5\)
\(\left(2\times x-3\right)\times3=15\)
\(2\times x-3=15:3\)
\(2\times x-3=5\)
\(2\times x=5-3\)
\(2\times x=2\)
\(x=2:2\)
\(x=1\)