![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, -15 + \(x\) = -14 - (-57)
-15 + \(x\) = -14 + 57
\(x\) = -14 + 57 + 15
\(x\) = 58
b, (-14) + \(x\) - 7 = -10
\(x\) = -10 + 7 + 14
\(x\) = -3 + 14
\(x\) = 11
![](https://rs.olm.vn/images/avt/0.png?1311)
a) /x-1/-(-26)=-10
=> /x-1/=-10+(-26)
/x-1/=-36
=> x = rỗng
b) 17-/x+1/=42
/x+1/=17-42=-25
/x+1/=-25
=> x = rỗng
c) 57+(7-32)=319-(x+319)
32=319-(x+319)
x+319=319-32
x+319=287
=> x =(-32)
tick cho mình nhé
( x - 1/2 ) : 3/11 =11/4
(2x + 3/8 ) . 7/4 =-21/32
x - x/3 = 3/57 : 12/19
nhanhh giúp tui nha các babee
![](https://rs.olm.vn/images/avt/0.png?1311)
( x - 1/2 ) : 3/11 =11/4
x - 1/2 = 11/4 x 3/11
x - 1/2 = 3/4
x = 3/4 + 1/2
x = 5/4
Vậy x = 5/4
(2x + 3/8 ) . 7/4 =-21/32
2x + 3/8 = -21/32 : 7/4
2x + 3/8 = -3/8
2x = -3/8 - 3/8
2x = -3/4
x = -3/4 : 2
x = -3/8
Vậy x = -3/8
![](https://rs.olm.vn/images/avt/0.png?1311)
1, -15 + \(x\) = -14 - (-57)
-15 + \(x\) = -14 + 57
\(x\) = -14 + 57 + 15
\(x\) = 43 + 15
\(x\) = 58
2, (-14) + \(x\) - 7 = -10
-14 + \(x\) - 7 = -10
- 21 + \(x\) = - 10
\(x\) = -10 + 21
\(x\) = 11
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{2}{5}-\frac{2}{5}x+\frac{1}{3}=x-\frac{7}{15}\)
\(\Leftrightarrow\frac{11}{15}-\frac{2x}{5}=x-\frac{7}{15}\)
\(\Leftrightarrow\frac{2x}{5}=x-\frac{7}{15}-\frac{11}{15}\)
\(\Leftrightarrow-\frac{2x}{5}=x-\frac{5}{6}\)
\(\Leftrightarrow-\frac{2x}{5}=x.5-\frac{5}{6}.5\)
\(\Leftrightarrow-2x=5x-6\)
\(\Leftrightarrow-2x=-5x-6-5x\)
\(\Leftrightarrow-7x=-6\)
\(\Rightarrow x=\frac{6}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, A= 1/5.6+1/6.7+1/7.8+...+1/24.25
=1/5-1/6+1/6-1/7+1/7-1/8+...+1/24-1/25
=1/5-1/25
=4/25
hok tốt k nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(A=\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}+...+\dfrac{1}{24}-\dfrac{1}{25}\)
\(=\dfrac{1}{5}-\dfrac{1}{25}=\dfrac{4}{25}\)
b: \(B=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{8}-\dfrac{1}{19}+\dfrac{1}{19}-\dfrac{1}{32}+\dfrac{1}{32}-\dfrac{1}{57}+\dfrac{1}{57}-\dfrac{1}{87}\)
\(=\dfrac{2}{15}+\dfrac{1}{8}-\dfrac{1}{87}\)
=859/3480
![](https://rs.olm.vn/images/avt/0.png?1311)
a,280: (7 + 3 : x ) = 4
(7 + 3 : x ) = 280:4
( 7+ 3: x) =70
3 : x = 70-7
3:x=63
x=63.3
x= 189
b,(x+5).19:13=57
(x+5).19 =57.13
(x+5).19 =741
(x+5) =741:19
(x+5) =39
x=39-5
x = 34
c,6.(28-8.x)=72
(28-8.x)=72:6
(28-8.x)=12
8x=28-12
8x=16
x=16:8
X=2
Đề có đúng không bạn?
\(57+\left(7-32\right)=319-\left(x+3^{19}\right)\\ \Rightarrow57-25=319-\left(x+3^{19}\right)\\ \Rightarrow32=319-\left(x+3^{19}\right)\\ \Rightarrow287=x+3^{19}\\ \Rightarrow x=3^{19}-287\)