TÌM X:
200-18:(372:3:x-1)-28=166
tìm x biết 200 - 18:( 372 : x - 1)- 28 =166
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
\(200-18:\left(272:x-1\right)-28=166\)
\(-18:\left(272:x-1\right)=-6\)
\(272:x-1=3\)
\(272:x=4\)
\(x=93\)
\(200 - 18 : ( 372 : x - 1 ) - 28 = 166\)
\(⇒200 - 28 - 18 : ( 372 : x - 1 )=166\)
\(⇒172 - 18 : ( 372 : x - 1 ) =166\)
\(⇒ 18 : ( 372 : x - 1 ) = 172 - 166\)
\(⇒ 18 : ( 372 : x - 1 ) = 6\)
\(⇒ ( 372 : x - 1 ) = 18 : 6\)
\(⇒ ( 372 : x - 1 ) = 3\)
\(⇒ 372 : x = 3+1\)
\(⇒ 372 : x = 4\)
\(⇒ x = 372 : 4\)
\(⇒ x = 93\)
\(^ofer\)
bài 1: 200 -18 : [ 372 : 3 : X - 1] - 28 -166
\(\Leftrightarrow18:\left[124:x-1\right]=6\)
\(\Leftrightarrow124:x-1=3\)
hay x=31
200 - 18 : ( 372 : 3 : x - 1 ) - 28 = 166
200 - 18 : ( 372 : 3 : X -1 ) -28 = 166
suy ra 18 : ( 372 : 3 : X - 1 ) - 28 = 200 -166 = 34
Suy ra 18 : ( 372 : 3 : X -1 ) = 34 + 28 = 62
Suy ra 372 : 3 : X -1 = 18 : 62
Suy ra 124 : x -1 = 9/31
Suy ra 124 : x = 9/31 +1 =40/31
Suy ra X = 124 : 40/31
Suy ra X = 961/10 = 96,1
200-18:(372:3.x-1)-28=166
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 =\(\frac{1}{31}\).
tinh x
a - 420 : ( x : 39 ) = 105
b - 200 - 18 : ( 372 : 3 x - 1 ) - 28 = 166
a) -420 :(x:39)=105
x:39=-420 : 105
x : 39=\(\dfrac{-14}{5}\)
x=\(\dfrac{-546}{5}\)
a - 420 : ( x : 39 ) = 105
⇒ x : 39 = 420 : 105
⇒ x : 39 = 4
⇒ x = 4 * 39
⇒ x = 156
b)-200 -18 :(372 : x-1)-28=166
-200-18 :(372:x-1)=194
18:(372:x-1)=-200-194
18:(372:x-1)=-394
372:x-1=-9/197
372:x=-9/197+1
372:x=188/197
x=\(\dfrac{18321}{47}\)
tìm x:
200 - 18 : ( 372 : 3 : x - 1 ) - 28 = 166
giải rõ ràng từng phần cho mk nhé!
200 - 18 : ( 372 : 3 : x - 1 ) - 28 = 166
=> 200 - 18 : ( 124 : x - 1 ) - 28 = 166
=> 200 - 28 - 18 : ( 124 : x - 1) = 166
=> 172 - 18 : (124 : x - 1) = 166
=> 18 : (124 : x - 1) = 172 - 166 = 6
=> 124 : x - 1 = 18 : 6 = 3
=> 124 : x = 3 + 1 = 4
=> x = 124 : 4 = 31
Bài làm
200 - 18 : ( 372 : 3 : x - 1 ) - 28 = 166
200 - 18 : ( 124 : x - 1 ) - 28 = 166
172 - 18 : ( 124 : x - 1 ) = 166
18 : ( 124 : x - 1 ) = 6
( 124 : x - 1 ) = 18 : 6
124 : x - 1 = 3
124 : x = 4
x = 31
Vậy x = 31
# Học tốt #
`câu 11;
200 - 18 : [372 ; 3 + x -1 ] - 28 = 166
200 - 18 : (372 : 3 + x - 1) - 28 = 166
=> 200 - 18 : (124 + x - 1) = 166 + 28
=> 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 = 4
=> x = 4 - 124 = -120
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=4-124
x=-120
vậy x=-120
bài 1: 200 -18 : [ 372 : 3 : X - 1] - 28 =166
x là số cần tìm
giải gọn lại giùm nhé
\(\Leftrightarrow18:\left[124:x-1\right]=6\)
\(\Leftrightarrow124:x-1=3\)
\(\Leftrightarrow x=31\)
200 - 18 : (372:3.x-1)-28=166
(100-99+98-97+96-95+...+4-3+2-1):50+2010-12.x=91
x-(31/3+31/15+31/35+31/63+31/99+31/143)=9/13
#)Giải :
\(200-18:\left(372:3x-1\right)-28=166\)
\(\Leftrightarrow200-18:\left(372:3x-1\right)=194\)
\(\Leftrightarrow18:\left(372:3x-1\right)=6\)
\(\Leftrightarrow372:3x-1=3\)
\(\Leftrightarrow3x-1=124\)
\(\Leftrightarrow3x=125\)
\(\Leftrightarrow x=\frac{125}{3}\)
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
=> 372 : 3.x = 3 + 1
=> 372 : 3.x = 4
=> 3.x = 372 : 4
=> 3.x = 93
=> x = 93 : 3
=> x = 31
#)Next:
\(\left(100-99+98-97+...+2-1\right):50+2010-12x=91\)
\(\Leftrightarrow\left[\left(100-99\right)+\left(98-97\right)+...+\left(2-1\right)\right]:50+2010-12x=91\)
\(\Leftrightarrow\left[1+1+...+1\right]:50+2010-12x=91\)
\(\Leftrightarrow50:50+2010-12x=91\)
\(\Leftrightarrow1+2010-12x=91\)
\(\Leftrightarrow2011-12x=91\)
\(\Leftrightarrow12x=1920\)
\(\Leftrightarrow x=160\)