Tìm x:
a) 1/3 + 1/6 + x = 3/4
b) 1/2 + 1/3 – x = 2/3
c) 2/3 × 3/4 × x = 2/5
d) x : [ 1/4 : 1/2 ] = 2/3
e) 1/3 : 1/2 : x = 3/4
Các bạn giải giùm mình nhé
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
C
1
14 tháng 7 2017
a) Vì I 5 - x I = 4.Vậy ta có 2 kết quả : 5 - x = 4 và 5 - x = (-4).
5 - x = 4 => x = 1.
5 - x = -4 => x = 9.
b) Vì I 1- 2.x I = 5. => 1 - 2x = 5 và 1 - 2x = -5
Nếu 1 - 2x = 5 => x = -2. Nếu 1 - 2x = -5 => x = 3.
c) Ta có 2x + 3 = x - 1 và 2x + 3 = -(x-1).
Nếu 2x + 3 = x - 1. Giải phương trình ta có : 2x - x = -1 - 3. => x = -4.
Nếu 2x + 3 = -(x - 1).Ta có : 2x + 3 = -x + 1.Giải phương trình ta có: 2x + x = 1 - 3. => -2/3.
d) Giống câu trên ta có: x = 1,5.
H9
HT.Phong (9A5)
CTVHS
14 tháng 6 2023
a) \(2\dfrac{3}{4}-x=\dfrac{3}{4}\)
\(\Rightarrow\dfrac{11}{4}-x=\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{11}{4}-\dfrac{3}{4}=\dfrac{8}{4}=2\)
b) \(x:\dfrac{5}{6}=-\dfrac{3}{5}\)
\(\Rightarrow x=-\dfrac{3}{5}.\dfrac{5}{6}=-\dfrac{15}{30}=-\dfrac{1}{2}\)
c) \(1\dfrac{1}{3}+\dfrac{2}{3}:x=1\)
\(\Rightarrow\dfrac{2}{3}:x=1-1\dfrac{1}{3}\)
\(\Rightarrow\dfrac{2}{3}:x=-\dfrac{1}{3}\)
\(\Rightarrow x=\dfrac{2}{3}:-\dfrac{1}{3}\)
\(\Rightarrow x=-2\)
H9
HT.Phong (9A5)
CTVHS
14 tháng 6 2023
d) \(x-\dfrac{1}{9}=\dfrac{8}{3}\)
\(\Rightarrow x=\dfrac{8}{3}+\dfrac{1}{9}\)
\(\Rightarrow x=\dfrac{25}{9}\)
e) \(\dfrac{1}{2}x+650\%x-x=-6\)
\(\Rightarrow\dfrac{1}{2}x+\dfrac{13}{2}x-x=-6\)
\(\Rightarrow x\left(\dfrac{1}{2}+\dfrac{13}{2}-1\right)-6\)
\(\Rightarrow6x=-6\)
\(\Rightarrow x=\dfrac{-6}{6}=-1\)
g) \(2\left(x-\dfrac{1}{2}\right)+3\left(-1+\dfrac{x}{3}\right)=x\left(\dfrac{2}{x}-1\right)\) \(\text{Đ}K:x\ne0\)
\(\Rightarrow2x-1-3+x=2-x\)
\(\Rightarrow3x-4=2-x\)
\(\Rightarrow3x+x=2+4\)
\(\Rightarrow4x=6\)
\(\Rightarrow x=\dfrac{6}{4}=\dfrac{3}{2}\)
29 tháng 6 2019
\(a,\frac{1}{2}x+\frac{5}{2}=\frac{7}{2}x-\frac{3}{4}\)
\(\Leftrightarrow\frac{1}{2}x+\frac{5}{2}-\frac{7}{2}x=-\frac{3}{4}\)
\(\Leftrightarrow\frac{1}{2}x-\frac{7}{2}x+\frac{5}{2}=-\frac{3}{4}\)
\(\Leftrightarrow-3x+\frac{5}{2}=-\frac{3}{4}\)
\(\Leftrightarrow-3x=-\frac{13}{4}\)
\(\Leftrightarrow x=-\frac{13}{4}:(-3)=-\frac{13}{4}:\frac{-3}{1}=-\frac{13}{4}\cdot\frac{-1}{3}=\frac{13}{12}\)
29 tháng 6 2019
\(b,\frac{2}{3}x-\frac{2}{5}=\frac{1}{2}x-\frac{1}{3}\)
\(\Leftrightarrow\frac{2}{3}x-\frac{2}{5}-\frac{1}{2}x=-\frac{1}{3}\)
\(\Leftrightarrow\frac{2}{3}x-\frac{1}{2}x-\frac{2}{5}=-\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{6}x-\frac{2}{5}=-\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{6}x=\frac{1}{15}\)
\(\Leftrightarrow x=\frac{1}{15}:\frac{1}{6}=\frac{1}{15}\cdot6=\frac{6}{15}=\frac{2}{5}\)
\(c,\frac{1}{3}x+\frac{2}{5}(x+1)=0\)
\(\Leftrightarrow\frac{1}{3}x+\frac{2}{5}x+\frac{2}{5}=0\)
\(\Leftrightarrow\frac{11}{15}x=-\frac{2}{5}\)
\(\Leftrightarrow x=-\frac{6}{11}\)
d,e,f Tương tự
HP
0
TG
4 tháng 3 2021
a) \(\dfrac{1}{2}+x=\dfrac{5}{6}\)
\(\Rightarrow x=\dfrac{5}{6}-\dfrac{1}{2}=\dfrac{5}{6}-\dfrac{3}{6}=\dfrac{2}{6}=\dfrac{1}{3}\)
b) \(x+\dfrac{1}{4}=\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{3}{4}-\dfrac{1}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)
c) \(x-\dfrac{1}{5}=\dfrac{3}{10}\)
\(\Rightarrow x=\dfrac{3}{10}+\dfrac{1}{5}=\dfrac{3}{10}+\dfrac{2}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)
d) \(\dfrac{5}{6}-x=\dfrac{1}{3}\)
\(\Rightarrow x=\dfrac{5}{6}-\dfrac{1}{3}=\dfrac{5}{6}-\dfrac{2}{6}=\dfrac{3}{6}=\dfrac{1}{2}\)
e) \(\dfrac{3}{10}+x=\dfrac{1}{2}\)
\(\Rightarrow x=\dfrac{1}{2}-\dfrac{3}{10}=\dfrac{5}{10}-\dfrac{3}{10}=\dfrac{2}{10}=\dfrac{1}{5}\)
g) \(x+\dfrac{1}{4}=\dfrac{3}{8}\)
\(\Rightarrow x=\dfrac{3}{8}-\dfrac{1}{4}=\dfrac{3}{8}-\dfrac{2}{8}=\dfrac{1}{8}\)
TP
4 tháng 3 2021
a) 12+x=5612+x=56
⇒x=56−12=56−36=26=13⇒x=56−12=56−36=26=13
b) x+14=34x+14=34
⇒x=34−14=24=12⇒x=34−14=24=12
c) x−15=310x−15=310
⇒x=310+15=310+210=510=12⇒x=310+15=310+210=510=12
d) 56−x=1356−x=13
⇒x=56−13=56−26=36=12⇒x=56−13=56−26=36=12
e) 310+x=12310+x=12
⇒x=12−310=510−310=210=15⇒x=12−310=510−310=210=15
g) x+14=38x+14=38
⇒x=38−14=38−28=18⇒x=38−14=38−28=18
Đọc tiếp
12 tháng 7 2019
\(a,\frac{1}{3}+\frac{1}{2}:x=\frac{1}{5}\)
\(\Leftrightarrow\frac{1}{2}:x=\frac{1}{5}-\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{2}:x=\frac{3}{15}-\frac{5}{15}\)
\(\Leftrightarrow\frac{1}{2}:x=\frac{-2}{15}\)
\(\Leftrightarrow x=\frac{1}{2}:\frac{-15}{2}=\frac{-15}{4}\)
12 tháng 7 2019
\(b,\frac{1}{3}x+\frac{2}{5}\left[x+1\right]=0\)
\(\Leftrightarrow\frac{1}{3}x+\frac{2}{5}x+\frac{2}{5}=0\)
\(\Leftrightarrow\frac{11}{15}x=-\frac{2}{5}\Leftrightarrow x=\frac{-2}{5}:\frac{11}{15}=\frac{-2}{5}\cdot\frac{15}{11}=\frac{-2}{1}\cdot\frac{3}{11}=\frac{-6}{11}\)
\(a,\frac{1}{3}+\frac{1}{6}+x=\frac{3}{4}\) \(b,\frac{1}{2}+\frac{1}{3}-x=\frac{2}{3}\) \(c,\frac{2}{3}\cdot\frac{3}{4}\cdot x=\frac{2}{5}\)
\(\left(\frac{1}{3}+\frac{1}{6}\right)+x=\frac{3}{4}\) \(\left(\frac{1}{2}+\frac{1}{3}\right)-x=\frac{2}{3}\) \(\left(\frac{2}{3}\cdot\frac{3}{4}\right)\cdot x=\frac{2}{5}\)
\(\frac{1}{2}+x=\frac{3}{4}\) \(\frac{5}{6}-x=\frac{2}{3}\) \(\frac{1}{2}\cdot x=\frac{2}{5}\)
\(x=\frac{3}{4}-\frac{1}{2}\) \(x=\frac{5}{6}-\frac{2}{3}\) \(x=\frac{2}{5}:\frac{1}{2}\)
\(x=\frac{1}{4}\) \(x=\frac{1}{6}\) \(x=\frac{4}{5}\)
\(d,x:\left(\frac{1}{4}:\frac{1}{2}\right)=\frac{2}{3}\) \(e,\frac{1}{3}:\frac{1}{2}:x=\frac{3}{4}\)
\(x:\frac{1}{2}=\frac{2}{3}\) \(\frac{1}{3}:\frac{1}{2}=\frac{3}{4}\cdot x\)
\(x=\frac{2}{3}\cdot\frac{1}{2}\) \(\frac{2}{3}=\frac{3}{4}\cdot x\)
\(x=\frac{1}{3}\) \(x=\frac{2}{3}:\frac{3}{4}\)
\(x=\frac{8}{9}\)
a) 1/3 + 1/6 +x = 3/4 b) 1/2 + 1/3 - x = 2/3
5/6 - x = 2/3
x =5/6 -2/3
x = 1/6
1/2+ x =3/4
x = 3/4 -1/2
x = 1/4