Tìm x biết : 200 - 18 : ( 42:3*x - 13 ) - 28 = 154
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2 tháng 8 2016
200 - 18: (42 : 3 x X - 1) - 28 = 154
200 - 18 :(14 x X -1) = 182
18 : (14X - 1) = 182
18: 14X - 18 = 182
18 : 14X = 200
14X = 0,09
X = \(\frac{9}{1400}\)
PH
16 tháng 5 2022
a.-1,75-(-\(\dfrac{1}{9}\)-2\(\dfrac{1}{8}\))
-1,75-\(\dfrac{1}{9}+\dfrac{17}{8}\)
\(-\dfrac{7}{4}-\dfrac{1}{9}+\dfrac{17}{8}\)
\(\dfrac{-126}{72}-\dfrac{8}{72}+\dfrac{153}{72}\)
=\(\dfrac{19}{72}\)
PH
16 tháng 5 2022
b.\(\dfrac{-1}{12}-\left(2\dfrac{5}{8}-\dfrac{1}{3}\right)\)
\(\dfrac{-1}{12}-\left(\dfrac{21}{8}-\dfrac{1}{3}\right)\)
\(\dfrac{-1}{12}-\dfrac{21}{8}+\dfrac{1}{3}\)
\(\dfrac{-2}{24}-\dfrac{63}{24}+\dfrac{64}{24}\)
=\(\dfrac{-1}{24}\)
MH
8 tháng 4 2022
200 - 18 : (372 : x - 1) - 28 = 166
200 - 18 : (372 : x - 1) = 166 + 28
200 - 18 : (372 : x - 1) = 194
18 : (372 : x - 1) = 200 - 194
18 : (372 : x - 1) = 6
372 : x - 1 = 18 : 6
372 : x - 1 = 3
372 : x = 3 + 1
372 : x = 4
x = 372 : 4
x = 93
8 tháng 4 2022
\(200-18:\left(272:x-1\right)-28=166\)
\(-18:\left(272:x-1\right)=-6\)
\(272:x-1=3\)
\(272:x=4\)
\(x=93\)
TC
3
1 tháng 7 2016
a ) | x + 1/3 | = 5/6
+) x + 1/3 = 5/6 hay x + 1/3 = -5/6
x = 5/6 - 1/3 x = -5/6 - 1/3
x = 1/2 x =-7/6
b ) 11/13 - ( 5/42 - x ) = - ( 15/28-11/13 )
11/13 - ( 5/42 - x ) = 113/364
( 5/42 - x ) = 11/13 - 113/364
( 5/42 - x ) = 15/28
x = 5/42 - 15/28
x = -5/12
c ) | x |/186 = ( 1 - 303030 / 313131 ) + ( 616161 / 626262 - 1 )
| x | / 186 = 1/62
| x | = 1/62 . 186
| x | = 3
x = 3 hoặc -3
LV
3
20 tháng 8 2020
\(\frac{11}{13}-\left(\frac{5}{42}-x\right)=-\left(\frac{15}{28}-\frac{11}{13}\right)\)
\(\frac{11}{13}-\frac{5}{42}+x=-\frac{15}{28}+\frac{11}{13}\)
\(\frac{-5}{42}+x=-\frac{15}{28}+\left(\frac{11}{13}-\frac{11}{13}\right)\)
\(\frac{-5}{42}+x=-\frac{15}{28}\)
\(x=-\frac{15}{28}+\frac{5}{42}\)
\(x=-\frac{45}{84}+\frac{10}{84}\)
\(x=-\frac{35}{84}\)
Vậy \(x=-\frac{35}{84}\).
20 tháng 8 2020
\(\frac{11}{13}-\left(\frac{5}{42}-x\right)=\frac{113}{364}\)
\(\left(\frac{5}{42}-x\right)=\frac{11}{13}-\frac{113}{364}\)
\(\left(\frac{5}{42}-x\right)=\frac{15}{28}\)
\(x=\frac{5}{42}-\frac{15}{28}\)
\(x=-\frac{5}{12}\)
vậy \(x=-\frac{5}{12}\)
SH
2 tháng 5 2016
200 - 18 : ( 372 : 3 : X - 1 ) - 28 = 166
200 - 18 : ( 372 : 3 : X - 1 ) = 166 + 28
200 - 18 : ( 372 : 3 : X - 1 ) = 194
200 - 18 : ( 124 . X - 1 ) = 194
18 : ( 124 . X - 1 ) = 200 - 194
18 : ( 124 . X - 1 ) = 6
124 . X - 1 = 18 : 6
124 . X - 1 = 3
124 . X = 3 + 1
124 . X = 4
X = 4 : 124
X = 1/31.
2 tháng 5 2016
200-18:(372:3:x-1)-28=166
200-18:(372:3:x-1)=166+28
200-18:(372:3:x-1)=194
18:(372:3:x-1)=200-194
18:(372:3:x-1)=6
372:3:x-1=18:6
372:3:x-1=3
124:x-1=3
124:x=3+1
124:x=4
x=124:4
x=31
7 tháng 7 2017
a) x - 12= 91
x= 91 + 12
x= 103
b) 42 - x= 2 . 18
42 - x= 36
x = 42 - 36
x = 6
c) (13 - x ) .28 =28
13 - x= 28 : 28 =1
x= 13 - 1
x= 12
7 tháng 7 2017
a, x - 12 = 7 . 13
x - 12 = 91
x = 91 + 12
x = 103
b, 43 - x = 2.18
43 - x = 36
x = 43 - 36
x = 6
c, ( 13 - x ). 28 = 28
13 - x = 28 ÷ 28
13 -x = 1
x = 13 - 1
x = 12
25 tháng 9 2016
a, 11/13 - ( 5/42 - x ) = - (5/28 - 11/13)
11/13 - (5/42 - x) = - 5/28 + 11/13
- (5/42 - x) + 5/28 = -11/13 + 11/13
- 5/42 + x + 5/28 = 0
- 5/42 + x = 0 - 5/28
- 5/42 + x = - 5/28
x = -5/28 +5/42
x = - 5/84
b, / x + 4/15 \ - / - 3,75 \ = - / - 2,15 \
./ x + 4/15 \ - 3,75 = - 2,15
/ x + 4/15 \ = -2,15 + 3,75
/ x + 4/15 \ = 1,6
x + 4 / 15 = 1,6 hoặc x+ 4/15 = - 1,6
x = 1,6 - 4/15 x = - 1,6 -4/15
x = 4/3 x = -28/15
Vậy x = 4/3 hoặc x = - 28/15
c, ( 0,25 - 30% x ) . 1/3 = 1/4 - 31/6
( 1/4 - 3/10 x ) . 1/3 = - 59/12
( 1/4 - 3/10 x ) = - 59/12 : 1/3
1/4 - 3/10 x = - 59/4
3/10 x = 1/4 + 59/4
3/10 x = 15
x = 15 : 3/10
x = 50
d, ( x - 1/2 ) : 1/3 + 5/7 = 68/7
( x - 1/2 ) : 1/3 = 68/7 - 5/7
( x - 1/2 ) : 1/3 = 63/7
( x - 1/2 ) = 63/7 . 1/3
x -1/2 = 3
x = 3 + 1/2
x = 7/2
Lời giải:
$200-18:(42:3\times x-13)-28=154$
$200-28-18:(42:3\times x-13)=154$
$172-18:(42:3\times x-13)=154$
$18:(42:3\times x-13)=172-154=18$
$42:3\times x-13=18:18=1$
$14\times x-13=1$
$14\times x=13+1=14$
$x=14:14=1$
\(200-18:\left(42:3\times x-13\right)-28=154\)
\(200-18:\left(42:3\times x-13\right)=182\)
\(18:\left(42:3\times x-13\right)=200-182\)
\(18:\left(42:3\times x-13\right)=18\)
\(42:3\times x-13=18:18\)
\(42:3\times x-13=1\)
\(42:3\times x=1+13\)
\(42:3\times x=14\)
\(14\times x=14\)
\(x=14:14\)
\(x=1\)