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\(\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\frac{5}{3}+\frac{-1}{4}+\frac{1}{3}+\frac{-3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)+\left(\frac{-1}{4}+\frac{-3}{4}\right)\)
\(=\frac{6}{3}+\frac{-4}{4}\)
\(=2+\left(-1\right)\)
\(=1\)
a) \(\dfrac{13}{20}+\dfrac{3}{5}+x=\dfrac{5}{6}\)
\(\Rightarrow\dfrac{5}{4}+x=\dfrac{5}{6}\)
\(\Rightarrow x=\dfrac{5}{6}-\dfrac{5}{4}\)
\(\Rightarrow x=\dfrac{-5}{12}\)
b) \(x+\dfrac{1}{3}=\dfrac{2}{5}-\dfrac{-1}{3}\)
\(\Rightarrow x+\dfrac{1}{3}=\dfrac{11}{15}\)
\(\Rightarrow x=\dfrac{11}{15}-\dfrac{1}{3}\)
\(\Rightarrow x=\dfrac{2}{5}\)
c)\(\dfrac{-5}{8}-x=\dfrac{-3}{20}-\dfrac{-1}{6}\)
\(\dfrac{-5}{8}-x=\dfrac{1}{60}\)
\(\Rightarrow x=\dfrac{-5}{8}-\dfrac{1}{60}\)
\(\Rightarrow x=\dfrac{-77}{120}\)
d) \(\dfrac{3}{5}-x=\dfrac{1}{4}+\dfrac{7}{10}\)
\(\Rightarrow\dfrac{3}{5}-x=\dfrac{19}{20}\)
\(\Rightarrow x=\dfrac{3}{5}-\dfrac{19}{20}\)
\(\Rightarrow x=\dfrac{-7}{20}\)
e) \(\dfrac{-3}{7}-x=\dfrac{4}{5}+\dfrac{-2}{3}\)
\(\Rightarrow\dfrac{-3}{7}-x=\dfrac{2}{15}\)
\(\Rightarrow x=\dfrac{-3}{7}-\dfrac{2}{15}\)
\(\Rightarrow x=\dfrac{-59}{105}\)
g) \(\dfrac{-5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\)
\(\Rightarrow\dfrac{-5}{6}-x=\dfrac{1}{4}\)
\(\Rightarrow x=\dfrac{-5}{6}-\dfrac{1}{4}\)
\(\Rightarrow x=\dfrac{-13}{12}\)
a) \(\dfrac{1}{2}-\left(x+\dfrac{1}{3}\right)=\dfrac{5}{6}\)
\(\Rightarrow x+\dfrac{1}{3}=\dfrac{1}{2}-\dfrac{5}{6}\)
\(\Rightarrow x+\dfrac{1}{3}=\dfrac{-1}{3}\)
\(\Rightarrow x=\dfrac{-1}{3}-\dfrac{1}{3}\)
\(\Rightarrow x=\dfrac{-2}{3}\)
b)\(\dfrac{3}{4}-\left(x+\dfrac{1}{2}\right)=\dfrac{4}{5}\)
\(\Rightarrow x+\dfrac{1}{2}=\dfrac{3}{4}-\dfrac{4}{5}\)
\(\Rightarrow x+\dfrac{1}{2}=\dfrac{-1}{20}\)
\(\Rightarrow x=\dfrac{-1}{20}-\dfrac{1}{2}\)
\(\Rightarrow x=\dfrac{-11}{20}\)
c) \(\dfrac{3}{35}-\left(\dfrac{3}{5}+x\right)=\dfrac{2}{7}\)
\(\Rightarrow\dfrac{3}{5}+x=\dfrac{3}{35}-\dfrac{2}{7}\)
\(\Rightarrow\dfrac{3}{5}+x=\dfrac{-1}{5}\)
\(\Rightarrow x=\dfrac{-1}{5}-\dfrac{3}{5}\)
\(\Rightarrow x=\dfrac{-4}{5}\)
d)\(\dfrac{2}{3}.x=\dfrac{4}{27}\)
\(\Rightarrow x=\dfrac{4}{27}:\dfrac{2}{3}\)
\(\Rightarrow x=\dfrac{2}{9}\)
e) \(\dfrac{-3}{5}.x=\dfrac{21}{10}\)
\(\Rightarrow x=\dfrac{21}{10}:\dfrac{-3}{5}\)
\(\Rightarrow x=\dfrac{-7}{2}\)
a) 3x-5 ⋮ x+2
+ (x+2) ⋮ (x+2)
⇒ 3(x+2) ⋮ (x+2)
⇒3x+6 ⋮ x+2
mà 3x-5 ⋮ x+2
⇒ 3x-5-(3x+6) ⋮ x+2
⇒ 3x-5-3x-6 ⋮ x+2
⇒ 3x-3x-5-6 ⋮ x+2
⇒-1 ⋮ x+2
⇒ x+2=-1
x =-1+2
x =1
vậy x=1
*câu b bnj cho đề bài rõ ràng hơn nhé
nếu đúng thì tích đúng cho mình nha
Số cần tìm là :
( 15 : 5 + 4 ) x 3 = 21
Vậy x = 21
vậy số cần tìm là 21
Nếu nhưng bạn làm ngược lại thì sẽ đc
15:5= 3. 3+4=7 7x3=21
KQ:21
#Học tốt
2n-1=2n+6-7
2n+6 chia hết cho n+3 rồi
suy ra 7 chia hết n+3
suyra n+3 thuộc {+-1;+-7}
suy ra n thuộc {-10;-4;-2;4}
vu quy dat cảm ơn bạn nhiều, mình hiểu dạng bài này rồi ^^
=(-1+2)-(3+4)-(5+6)-........-(2017+2018)
=1-7-11-........-4035
=-1009
1/4 + 1/3 : 3 * x = 5
1/3 : 3 * x = 1/4 -5
1/3 : 3 * x = -19/4
3 * x = 1/3 : (-19/4)
3 * x = -4/57
x = -4/57 : 3
x = -4/171
1/4 + 1/3 : 3.x = 5
3.x = 5. (1/4 + 1/3)
3.x = 5. 7.12
3.x = 35/12
x = 35/12 : 3
x = 35/36