\(x+\frac{2}{3}=2\frac{1}{2}\)

\(x+\frac{2}{3}=\frac{5}{2}\)

\(x=\frac{5}{2}-\frac{2}{3}\)

\(x=\frac{11}{6}\)

\(8,75.x+1,25.x=26,3\)

\(x.\left(8,75+1,25\right)=26,3\)

\(x.10=26,3\)

\(x=26,3\div10\)

\(x=2,63\)

\(x-4\frac{5}{6}=2\frac{1}{6}+\frac{5}{6}\)

\(x-\frac{29}{6}=3\)

\(x=\frac{47}{6}\)

\(5\frac{4}{5}+x-7\frac{7}{18}=15\frac{3}{4}\)

\(\frac{29}{5}+x-\frac{133}{18}=\frac{63}{4}\)

\(\frac{29}{5}+x=\frac{63}{4}+\frac{133}{18}\)

\(\frac{29}{5}+x=\frac{259}{8}\)

\(x=\frac{259}{8}-\frac{29}{5}\)

\(x=\frac{1063}{40}\)

a) x+30%x=-1.31

=> 100%x+30%x=-1.31

=>x.(100%+30%)=-1.31

=>x.13/10=-1.31=-1.31:13/10=-131/130

b) (x-1/2):1/3+5/7=9+5/7

=>(x-1/2).3+5/7=68/7

=>(x-1/2).3=68/7-5/7=9

=>x-1/2=9:3=3

=>x=3+1/2=3 1/2( hỗn số)

c) 1/2x-3/4=14/9.3/7

=>1/2x-3/4=2/3

=>1/2x=2/3+3/4=17/12

x=17/12:1/2=17/12.2=17/6

d) - 5/6 -x = 7/12+ -1/3

=>- 5/6 -x = 7/12+ -4/12=1/4

=> x = -5/6 -1/4=-13/12

e) x + 3/-15 = 1/3

=> x= 1/3 - -3/15 =1/3+3/15

=> x=5/15 + 3/15=8/15

f) (4,5 -2 x). (-1 4/7)=11/14

=> 4,5 -2x=11/14 : -3/7=11/14. -7/3=-11/6

=>-2x=-11/6-9/2= -11/6 -27/6 =-19/3

=>x= -19/3: -2x=19/6

Chúc bn thi HKII tốt!!!

ban hoc truong nao vay ? de cua ban giong cua minh lam

bạn học trường j mà giống đề bài mình zay

\(1-\left(5\frac{4}{9}+y-7\frac{7}{18}\right):15\frac{3}{4}=0\)

\(1-\left(\frac{49}{9}+y-\frac{133}{18}\right):\frac{63}{4}=0\)

\(1-\left(\frac{49}{9}+y-\frac{133}{18}\right)\times\frac{4}{63}=0\)

\(1-\frac{28}{81}-y\times\frac{4}{63}+\frac{38}{81}=0\)

\(1+\frac{38}{81}-\frac{28}{81}-y\times\frac{4}{63}=0\)

\(1+\frac{10}{81}-y\times\frac{4}{63}=0\)

\(\frac{91}{81}-y\times\frac{4}{63}=0\)

\(y\times\frac{4}{63}=\frac{91}{81}\)

\(y=\frac{91}{81}:\frac{4}{63}\)

\(y=\frac{637}{36}\)

P/s : Số hơi to 

\(1-\left(5\frac{4}{9}+y-7\frac{7}{18}\right):15\frac{3}{4}=0\)

\(\Rightarrow1-\left(\frac{49}{9}+y-\frac{133}{18}\right):\frac{63}{4}=0\)

\(\Rightarrow\left(\frac{98}{18}+y-\frac{133}{18}\right):\frac{63}{4}=1-0\)

\(\Rightarrow\left(-\frac{35}{18}+y\right):\frac{63}{4}=1\)

\(\Rightarrow-\frac{35}{18}+y=1\times\frac{63}{4}\)

\(\Rightarrow\frac{-35}{18}+y=\frac{63}{4}\)

\(\Rightarrow y=\frac{63}{4}--\frac{35}{18}\)

\(\Rightarrow y=\frac{63}{4}+\frac{35}{18}\)

\(\Rightarrow y=\frac{637}{36}\)

Vậy \(y=\frac{637}{36}\)

\(1-\left(5\frac{4}{9}+y-7\frac{7}{18}\right):15\frac{3}{4}=0\)

=> \(\left(5\frac{4}{9}+y-7\frac{7}{18}\right):15\frac{3}{4}=1-0\)

=> \(\left(\frac{49}{9}+y-\frac{133}{18}\right):\frac{63}{4}=1\)

=> \(\left(\frac{49}{9}-\frac{133}{18}\right)+y=1\cdot\frac{63}{4}\)

=>  \(\left(-\frac{35}{18}\right)+y=\frac{63}{4}\)  =>  \(y=\frac{63}{4}-\left(-\frac{35}{18}\right)=\frac{63}{4}+\frac{35}{18}\)

=>  \(y=\frac{637}{36}\)

Chúc bạn hk tốt!! k cho mình na

Bài 1:
a) \(2\)\(\dfrac{2}{3}\)\(=\dfrac{8}{3}\)
b) \(1\)\(\dfrac{5}{7}=\dfrac{12}{7}\)

a: \(\Leftrightarrow\left(\dfrac{13}{4}:x\right)\cdot\left(-\dfrac{5}{4}\right)=\dfrac{-10}{6}-\dfrac{5}{6}=\dfrac{-15}{6}=\dfrac{-5}{2}\)

\(\Leftrightarrow\dfrac{13}{4}:x=\dfrac{5}{2}\cdot\dfrac{5}{4}=\dfrac{25}{8}\)

hay \(x=\dfrac{13}{4}:\dfrac{25}{8}=\dfrac{13}{4}\cdot\dfrac{8}{25}=\dfrac{26}{25}\)

b: \(\Leftrightarrow\dfrac{3}{4}:x=\dfrac{11}{36}-\dfrac{1}{4}=\dfrac{2}{36}=\dfrac{1}{18}\)

=>\(x=\dfrac{3}{4}:\dfrac{1}{18}=\dfrac{54}{4}=\dfrac{27}{2}\)

c: \(\Leftrightarrow\left(-\dfrac{6}{5}+x\right):\left(-3.6\right)=-\dfrac{7}{4}+\dfrac{1}{4}\cdot8=\dfrac{1}{4}\)

=>x-6/5=-9/10

=>x=3/10

bài2 \(x\times\dfrac{15}{16}-x\times\dfrac{4}{16}=2\) 

     \(x\times\dfrac{11}{16}=2\) 

     \(x=2:\dfrac{11}{16}\) 

    \(x=\dfrac{32}{11}\)

Bài 1 : 

 \(\dfrac{x}{16}\times\left(2017-1\right)=2\)

          \(\dfrac{x}{16}\times2016=2\)

                      \(\dfrac{x}{16}=\dfrac{2}{2016}\)

                         \(x=\dfrac{2}{2016}\times16\)

                         \(x=\dfrac{1}{63}\)

1- (5\(\dfrac{4}{9}\) +x+7\(\dfrac{7}{18}\)) : 15\(\dfrac{3}{4}\) = 0 

1- (\(\dfrac{49}{9}+x+\dfrac{133}{18}\)) : \(\dfrac{63}{4}=0\) 

 (\(\dfrac{49}{9}+\dfrac{133}{18}\)+\(x\) ) : \(\dfrac{63}{4}\) = 1 - 0 

       (\(\dfrac{77}{6}\) + \(x\) ) : \(\dfrac{63}{4}\) = 1

         \(\dfrac{77}{6}+x\)         = 1 x \(\dfrac{63}{4}\) 

          \(\dfrac{77}{6}\) + \(x\)          = \(\dfrac{63}{4}\)

                  \(x\)            = \(\dfrac{63}{4}\) - \(\dfrac{77}{6}\)

                  \(x=\) \(\dfrac{35}{12}\)