a) x=7-2/5+1,62
x=8,22
Vậy x = 8,22
b)23/5-x=3/10
x=23/5-3/10
x=43/10
Vậy x = 43/10
c)2x-x=3/5+4/7
x=41/35
Vậy x = 41/35
d) x=7/2-5/7+1/13-0,25
x=951/364
Vậy x = 951/364
A = 8,22
B = 4 3/10
C = 41/35
D 2 223/364
a, -1,62 + 2/5 +x =7 b, 4 3/5+x= -1/5+1/2 c, -4/7-x=3/5-2x d, 5/7-1/13+0,25=3 1/2-x
-81/50+2/5-7=x x= 3/10 -x +2x = 3/5+4/7 -x = -951/364
-81+20-350/50 x= 3/10-4 3/5 x = 41/35 x= 951/364
x= -411/50 x= -43/10
a) \(-1,62+\dfrac{2}{5}+x=7\)
\(x=-1,62+\dfrac{2}{5}+7\)
\(x=-1,62+\dfrac{4}{10}+7\)
\(x=1,62+0,4+7\)
\(x=9,02\)
vậy \(x=9,02\)
b) \(4\dfrac{3}{5}-x=\dfrac{-1}{5}+\dfrac{1}{2}\)
\(x=\dfrac{23}{5}+\dfrac{-1}{5}+\dfrac{1}{2}\)
\(x=\dfrac{46}{10}+\dfrac{-2}{10}+\dfrac{5}{10}\)
\(x=\dfrac{49}{10}\)
vậy \(x=\dfrac{49}{10}\)
c)\(\dfrac{-4}{7}-x=\dfrac{3}{5}-2x\)
\(x=\dfrac{-4}{7}+\dfrac{3}{5}-2\)
\(x=\dfrac{-69}{35}\)
vậy \(x=\dfrac{-69}{35}\)
d)\(\dfrac{5}{7}-\dfrac{1}{13}+0,25=3\dfrac{1}{2}-x\)
\(x=\dfrac{5}{7}-\dfrac{1}{13}+\dfrac{1}{4}+\dfrac{7}{2}\)
\(x=\dfrac{260}{364}-\dfrac{28}{364}+\dfrac{91}{364}+\dfrac{1274}{364}\)
\(x=\dfrac{1597}{364}\)
vậy \(x=\dfrac{1597}{364}\)
a, -1,62 + \(\dfrac{2}{5}\) + x = 7
-\(\dfrac{81}{50}\) + \(\dfrac{2}{5}\) + x = 7
-\(\dfrac{61}{50}\) + x = 7
x = 7 + \(\dfrac{61}{50}\)
x = \(\dfrac{411}{50}\)
b, 4\(\dfrac{3}{5}\) - x = \(\dfrac{-1}{5}\) + \(\dfrac{1}{2}\)
\(\dfrac{23}{5}\) - x = -\(\dfrac{1}{5}\) + \(\dfrac{1}{2}\)
\(\dfrac{23}{5}\) - x = \(\dfrac{3}{10}\)
- x = \(\dfrac{3}{10}\) - \(\dfrac{23}{5}\)
- x = - (-\(\dfrac{43}{10}\))
x = \(\dfrac{43}{10}\)
c, \(\dfrac{-4}{7}\) - x = \(\dfrac{3}{5}\) - 2x
-\(\dfrac{4}{7}\) - x + 2x = \(\dfrac{3}{5}\)
- x + 2x = \(\dfrac{3}{5}\) + \(\dfrac{4}{7}\)
x = \(\dfrac{3}{5}\) + \(\dfrac{4}{7}\)
x = \(\dfrac{41}{35}\)
d, \(\dfrac{5}{7}\) - \(\dfrac{1}{13}\) + 0,25 = 3\(\dfrac{1}{2}\) - x
\(\dfrac{323}{364}\) = 3\(\dfrac{1}{2}\) - x
x = \(\dfrac{7}{2}\) - \(\dfrac{323}{364}\)
x = \(\dfrac{951}{364}\)
\(a,-1,62+\dfrac{2}{5}+x=7\)
\(x=7-\dfrac{2}{5}+1,26\)
\(x=8,22\)
\(b,=4\dfrac{3}{5}-x=\dfrac{-1}{5}+\dfrac{1}{2}\)
\(x=4\dfrac{3}{5}+\dfrac{1}{5}-\dfrac{1}{2}\)
\(x=4\dfrac{3}{10}\)
\(c,\dfrac{-4}{7}-x=\dfrac{3}{5}-2x\)
\(2x-x=\dfrac{3}{5}+\dfrac{4}{7}\)
\(x=\dfrac{41}{35}\)
\(d,\dfrac{5}{7}-\dfrac{1}{13}+0,25=3\dfrac{1}{2}-x\)
\(x=3\dfrac{1}{2}-\dfrac{5}{7}+\dfrac{1}{13}-0.25\)
\(x=2\dfrac{223}{364}\)
a) -1,62 + \(\dfrac{2}{5}\) + x = 7
x = 7 - 1,62 + \(\dfrac{2}{5}\)
x = 8,22
b) 4\(\dfrac{3}{5}\) - x = \(\dfrac{-1}{5}+\dfrac{1}{2}\)
x = 4\(\dfrac{3}{5}\) + \(\dfrac{1}{5}-\dfrac{1}{2}\)
x = 4\(\dfrac{3}{10}\)
c) \(\dfrac{-4}{^{ }7}-x=\dfrac{3}{5}-2x\)
\(2x-x=\dfrac{3}{5}+\dfrac{4}{7}\)
\(x=\dfrac{41}{35}\)
d) \(\dfrac{5}{7}-\dfrac{1}{13}+0,25=3\dfrac{1}{2}-x\)
\(x=3\dfrac{1}{2}-\dfrac{5}{7}+\dfrac{1}{13}-0.25\)
\(x=2\dfrac{223}{364}\)
a) -1,62 + 2/5 + x = 7
2/5 + x = 7 - ( -1,62 )
2/5 + x = 8,62
x = 8,62 - 2/5
x = 8,22
vậy x = 8,22
b) 4(2/5) - x = -1/5 + 1/2
23/5 - x = 3/10
x = 23/5 - 3/10
x = 43/10
Vậy x = 43/10
c) -4/7 - x = 3/5 - 2x
-x - 4/7 = -2x + 3/5
-x - 4/7 + 4/7 = -2x + 3/5 + 4/7
-x = -2x + 41/35
-x + 2x = -2x + 41/35 + 2x
x = 41/35
Vậy x = 41/35
d) 5/7 - 1/13 + 0,25 = 3(1/2) - x
5/7 - 1/13 + 1/4 = 7/2 - x
323/364 = 7/2 - x
x = 7/2 - 323/364
x = 951/364
Vậy x = 951/364
a) -1,62 + 2/5 + x = 7
2/5 + x = 7 - ( -1,62 )
2/5 + x = 8,62
x = 8,62 - 2/5
x = 8,22
vậy x = 8,22
b) 4(2/5) - x = -1/5 + 1/2
23/5 - x = 3/10
x = 23/5 - 3/10
x = 43/10
Vậy x = 43/10
c) -4/7 - x = 3/5 - 2x
-x - 4/7 = -2x + 3/5
-x - 4/7 + 4/7 = -2x + 3/5 + 4/7
-x = -2x + 41/35
-x + 2x = -2x + 41/35 + 2x
x = 41/35
Vậy x = 41/35
d) 5/7 - 1/13 + 0,25 = 3(1/2) - x
5/7 - 1/13 + 1/4 = 7/2 - x
323/364 = 7/2 - x
x = 7/2 - 323/364
x = 951/364
Vậy x = 951/364
a) -1,62 + 2/5 + x = 7
2/5 + x = 7 - ( -1,62 )
2/5 + x = 8,62
x = 8,62 - 2/5
x = 8,22
vậy x = 8,22
b) 4(2/5) - x = -1/5 + 1/2
23/5 - x = 3/10
x = 23/5 - 3/10
x = 43/10
Vậy x = 43/10
c) -4/7 - x = 3/5 - 2x
-x - 4/7 = -2x + 3/5
-x - 4/7 + 4/7 = -2x + 3/5 + 4/7
-x = -2x + 41/35
-x + 2x = -2x + 41/35 + 2x
x = 41/35
Vậy x = 41/35
d) 5/7 - 1/13 + 0,25 = 3(1/2) - x
5/7 - 1/13 + 1/4 = 7/2 - x
323/364 = 7/2 - x
x = 7/2 - 323/364
x = 951/364
Vậy x = 951/364
Bài 1.
a/ \(\left(-1,62\right)+\dfrac{2}{5}+x=7\) b/ \(4\dfrac{3}{5}-x=\dfrac{-1}{5}+\dfrac{1}{2}\) c/ \(\dfrac{-4}{7}-x=\dfrac{3}{5}-2x\) d/ \(\dfrac{5}{7}-\dfrac{1}{13}+0,25=3\dfrac{1}{2}-x\)
\(\left[\left(-1,62\right)+0,4\right]+x=7\) \(\dfrac{23}{5}-x=\dfrac{3}{10}\) \(2x-x=\dfrac{3}{5}-\dfrac{-4}{7}\) \(\dfrac{5}{7}-\dfrac{1}{13}+\dfrac{1}{4}=\dfrac{7}{2}-x\)
\(\left(-1,22\right)+x=7\) \(-x=\dfrac{3}{10}-\dfrac{23}{5}\) \(2x-x=\dfrac{41}{35}\) \(\dfrac{29}{49}+\dfrac{1}{4}=\dfrac{7}{2}-x\)
\(x=7+1,22\) \(-x=-\dfrac{43}{10}\) \(x=\dfrac{41}{35}\) \(\dfrac{165}{196}\) \(=\dfrac{7}{2}-x\)
\(x=8,22\) \(x=\dfrac{43}{10}\) \(-x=\dfrac{165}{196}-\dfrac{7}{2}\)
\(-x=-\dfrac{521}{196}\)
\(x=\dfrac{521}{196}\)
a) x = 7 - 2/5 + 1,62 = 8,22
b) x = 23/5 + 1/5 - 1/2 = 43/10
c) x = 4/7 + 3/5 = 41/35
d) => 323/364 = 7/2 - x => x = 951/364
a,x=7-2/5+1,62=8,22
b,x= 4/3/5+1/5-1/2=43/10
c, 2x-x=3/5+4/7
x=41/35
d, x= 3/1/2-5/7+1/13-0,25
=2/223/364
A,x=8,22
B,x=43/10
C,x=41/35
D,x=951364
a) x=8,22
b)x=4,3
c) x=\(\dfrac{41}{35}\)
d)x=2\(\dfrac{223}{364}\)
a) \(-1,62+\dfrac{2}{5}+x=7\)
\(\dfrac{2}{5}+x=7+1,62\)
\(0,4+x=8,62\)
\(x=8,62-0,4\)
\(x=8,22\)
b)\(4\dfrac{3}{5}-x=-\dfrac{1}{5}+\dfrac{1}{2}\)
\(\dfrac{23}{5}-x=\dfrac{3}{10}\)
\(x=\dfrac{23}{5}-\dfrac{3}{10}\)
\(x=\dfrac{43}{10}\)
c)\(-\dfrac{4}{7}-x=\dfrac{3}{5}-2x\)
\(\Leftrightarrow-\dfrac{4}{7}-x+2x=\dfrac{3}{5}-2x+2x\)
\(\Leftrightarrow-\dfrac{4}{7}+x=\dfrac{3}{5}\)
\(x=\dfrac{3}{5}+\dfrac{4}{7}\)
\(x=\dfrac{41}{35}\)
d)\(\dfrac{5}{7}-\dfrac{1}{13}+0,25=3\dfrac{1}{2}-x\)
\(\dfrac{58}{91}+\dfrac{1}{4}=\dfrac{7}{2}-x\)
\(\dfrac{323}{364}=\dfrac{7}{2}-x\)
\(x=\dfrac{7}{2}-\dfrac{323}{364}\)
\(x=\dfrac{951}{364}\)
a) -1,62 + 0,4 + x=7 b) 23/5-x= -1/5 + 1/2 c) -4/7-x=3/5-2x
-1,22 + x = 7 23/5-x= -2/10+5/10 -x= 3/5+4/7
x= 7+ 1,22 23/5-x= 3/10 -x= 41/35
x= 8,22 -x= 3/10-23/5 x= -41/35
-x= 3/10- 46/10
-x= -43/10
x= 43/10
D) 5/7-1/13+0,25= 7/2-X
x= 7/2-5/7+1/13-0,25
x= 951/364