Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
420:[75-(x-10)]=21
=> 75 - ( x-10) = 420 : 21 = 20
=> x -10 = 75 -20 = 55
=> x = 55 + 10 = 65
420 : [75 - (x - 10)] = 21
75 - (x - 10) = 420 : 21
75 - (x - 10) = 20
x - 10 = 75 - 20
x - 10 = 55
x = 55 + 10
x = 65
Vậy x = 65
420 : [ 75 - ( x - 10) ] = 21
75 - ( x - 10 ) = 420 : 21
75 - ( x - 10 ) = 20
x - 10 = 75 - 20
x -10 = 55
x = 55 + 10
x = 65
420:[75-(x*10)]=21
=> 75 - ( x*10) = 420 : 21 = 20
=> x *10 = 75 - 20 = 55
=> x = 55 : 10 = 5,5
\(420:\left[75-\left(x\cdot10\right)\right]=21\)
\(75-\left(x\cdot10\right)=420:21\)
\(75-\left(x\cdot10\right)=20\)
\(x\cdot10=75-20\)
\(x\cdot10=55\)
\(x=55:10\)
\(x=5,5\)
420 : [ 75 - ( x - 10 )] = 21
75 - ( x - 10 )= 20
x-10=55
x=65
420 : [ 75 - ( x - 10 )] = 21
75 - ( x - 10 ) = 420 : 21 ( TSC )
75 - ( x - 10 ) = 20
x - 10 = 75 - 20 ( TST )
x - 10 = 55
x = 55 + 10 ( TSBT )
x = 65
tính trừ bt nha bạn vế thương thì cũng tĩnh ra xong mới tính nha
a, \(x\) + \(\dfrac{1}{4}\) - \(\dfrac{3}{8}\) = \(\dfrac{7}{12}\)
\(x\) - \(\dfrac{1}{8}\) = \(\dfrac{7}{12}\)
\(x\) = \(\dfrac{7}{12}\) + \(\dfrac{1}{8}\)
\(x\) = \(\dfrac{17}{24}\)
Bài 2:
a, \(\dfrac{5}{23}\) \(\times\) \(\dfrac{17}{26}\) + \(\dfrac{5}{23}\) \(\times\) \(\dfrac{9}{26}\)
= \(\dfrac{5}{23}\) \(\times\) ( \(\dfrac{17}{26}\) + \(\dfrac{9}{26}\))
= \(\dfrac{5}{23}\) \(\times\) \(\dfrac{26}{26}\)
= \(\dfrac{5}{23}\)
b, \(\dfrac{3}{4}\) \(\times\) \(\dfrac{7}{9}\) + \(\dfrac{7}{4}\) \(\times\) \(\dfrac{3}{9}\)
= \(\dfrac{7}{12}\) + \(\dfrac{7}{12}\)
= \(\dfrac{14}{12}\)
= \(\dfrac{7}{6}\)
1) (x-17)*17=0
x-17=0
x=17
2) 32(x-11)=32
x-11=1
x=12
3) (x-25)-75=0
x-25=75
x=3
4) 575-(6*x+70)=445
6*x+70=130
6*x=60
x=10
5) 315+(125-x)=435
125-x=120
x=5
6) x-105:21=15
x-5=15
x=20
7) (x-105):21=15
x-105=315
x=420
8) (x-38):19=12
x-38=228
x=266
9) (x-15)*(x-19)=0
=>x-15=0 hoặc x-19=0
x=15 hoặc x=19
10) 96-3(x+1)=42
3(x+1)=54
x+1=18
x=17
a) ( x - 17 ) . 17 = 0
=> x - 17 = 0 : 17
=> x - 17 = 0
=> x = 0 + 17
=> x = 17
b) 32 . ( x - 11 ) = 32
=> x - 11 = 32 : 32
=> x - 11 = 1
=> x = 1 + 11
=> x = 12
c) ( x - 25 ) - 75 = 0
=> x - 25 = 0 + 75
=> x - 25 = 75
=> x = 75 + 25
=> x = 100
d) 575 - ( 6 . x + 70 ) = 445
=> 6 . x + 70 = 575 - 445
=> 6 . x + 70 = 130
=> 6 . x = 130 - 70
=> 6 . x = 60
=> x = 60 : 6
=> x = 10
e) 315 + ( 125 - x ) = 435
=> 125 - x = 435 - 315
=> 125 - x = 120
=> x = 125 - 120
=> x = 5
f) x - 105 : 21 = 15
=> x - 5 = 15
=> x = 15 + 5
=> x = 20
g) ( x - 105 ) : 21 = 15
=> x -105 = 15 . 21
=> x - 105 = 315
=> x = 315 + 105
=> x = 420
h) ( x - 38 ) : 19 = 12
=> x - 38 = 12 . 19
=> x - 38 = 228
=> x = 228 + 38
=> x = 266
i) ( x - 15 ) . ( x - 19 ) = 0
=> x - 15 = 0 => x = 0 + 15 => x = 15
x - 19 = 0 => x = 0 + 19 = x = 19
=> x = 15 ; 19
j) 96 - 3( x + 1 ) = 42
=> 3( x + 1 ) = 96 - 42
=> 3( x + 1 ) = 54
=> x + 1 = 54 : 3
=> x + 1 = 18
=> x = 18 - 1
=> x = 17
a) [ 25 - ( x + 1,85 ) ] : 3 = 7
[ 25 - ( x + 1,85) ] = 7x3
[ 25 - ( x + 1,85 ) ] = 21
x + 1,85= 25-21
x + 1,85= 4
x= 4-1,85
x= 2,15
a) [25 - (x + 1,85)] : 3 = 7
=> 25 - (x + 1,85) = 3 x 7
=> 25 - (x + 1,85) = 21
=> x + 1,85 = 25 - 21
=> x + 1,85 = 4
=> x = 4 - 1,85
=> x = 2,15
b) 420 : [75 - (x - 10)] = 21
=> 75 - (x - 10) = 420 : 21
=> 75 - (x - 10) = 20
=> x - 10 = 75 - 20
=> x - 10 = 55
=> x = 55 + 10
=> x = 65