28/15 x 0,25
tính: \(\frac{-\frac{2}{15}+\frac{2}{21}-\frac{2}{39}}{0,25-\frac{5}{28}+\frac{5}{52}}\)
tìm x: \(5^{x+2}+2.5^{x-1}=63^5\)
(15 x 19 - x - 0,15):0,25= 15 : 0,25
269,85 bạn nhé
( 15 x 19 - x - 0,15 ) : 0,25 = 15 : 0,25
15 x 19 - x - 0,15 = 15
285 - x - 0,15 = 15
285 - x = 15 + 0,15
285 - x = 15,15
x = 285 - 15,15
x = 169,85.
(15 x 19 - x - 0,15):0,25= 15 : 0,25
(15 x 19 - x - 0,15) : 0,25 = 15 : 0,25
15 x 19 - x - 0,15 = 15
285 - x = 15 + 0,15 = 15,15
x = 285 - 15,15 = 269,85
(15x19-x-0,15):0,25=15:0,25
15x19-x-0,15=15
285-x=15+0,15=15,15
x=285-15,15
x=269,85
Tìm x, biết:
a, 11/13 - ( 5/42 -x ) = - ( 5/28 - 11/13 )
b, | x + 4/15 | - | - 3,75 | = -| -2,15 |
c, ( 0,25 - 30% x ) . 1/3 = 1/4 - 31/6
d, ( x - 1/2 ) : 1/3 + 5/7 = 68/7
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
( 15 x 19 - X - 70 ) : 0,25 = 15 : 0,25
( 15 x 19 - X - 70 ) : 0,25 = 15 : 0,25
( 15 x 19 - X - 70 ) : 0,25 = 60
( 15 x 19 - X - 70 ) = 60 x 0,25
( 15 x 19 - X - 70 ) = 15
285 - X - 70 = 15
285 - X = 15 + 70
285 - X = 85
X = 285 - 85
X = 200
Vậy x = 200
( 15 x 19 - X - 70 ) : 0,25 = 15 : 0,25
( 15 x 19 - X - 70 ) : 0,25 = 60
( 15 x 19 - X - 70 ) = 60 x 0,25
( 15 x 19 - X - 70 ) = 15
285 - X - 70 = 15
285 - X = 15 + 70
285 - X = 85
X = 285 - 85
X = 200
Vậy x = 200
( 15 x 19 - y - 0,15 ) : 0,25 = 15 : 0,25
(285-y-0,15):0,25=60
284,85-y=60x0,25
284,85-y=15
y=284,85-15
y=269,85
nhớ tick cho mk nha
(15*19-x-0,15)/0,25=15/0,25
tick tớ đi buồn quá nãy giờ chưa ai tick.coi như giúp tớ đi
(15 nhân 19 - x - 0,15) :0,25 = 15: 0,25
(15 x 9 - X - 0,15 ) : 0, 25 = 15 : 0,25
( 15 x 9 - X - 0,15) : 0,25 = 60
15 x 9 - X - 15 = 60 x 0, 25
15 x 9 - X - 15 = 15
15 x 9 - X= 15 + 15
15 x 9 - X = 30
135 - X = 30
X = 135 - 30
X = 105
ủng hộ mk nha !!!! ^_^
\(\left(15.19-x-0,15\right):0,25=15:0,25\)
\(\left(15.19-x-0,15\right)=60.0,25\)
\(15.19-x-0,15=15\)
\(285-x=15+0,15=15,15\)
\(x=285-15,15=269,85\)
(15*19-X-0,15):0,25=15:0,25
(15x19-X-0,15):0,25=15:0,25
=>(15x19-X-0,15):0,25=60
=>15x19-X-0,15=60x0,25
=>15x19-X-0,15=15
=>15x19-X=15+0,15
=>285-X=15,15
=>X=285-15,15
=>X=269,86