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\(\frac{15.a+364}{a}\)= 697:17=41

15+\(\frac{364}{a}\)=41

\(\frac{364}{a}\)=41-15=26

       a=364:26

        a=14

368-27=\(\frac{a+350}{a}\)+315

314=\(\frac{a+350}{a}\)+315

\(\frac{a+350}{a}\)=341-315

\(\frac{a+350}{a}\)=26

a+350=26.a

26.a-a=350

(26-1).a=350

25.a=350

     a=350:25

     a=14

a.\(697:\frac{15.a+364}{a}=17\)

\(\Leftrightarrow\frac{15.a+364}{a}=41\)

\(\Leftrightarrow15.a+364=41.a\)

\(\Leftrightarrow15.a-41.a=-364\)

\(\Leftrightarrow a.\left(15-41\right)=-364\)

\(\Leftrightarrow a.\left(-26\right)=-364\)

\(\Leftrightarrow a=14\)

b.\(92.4-27=\frac{a+350}{a}+315\)

\(\Leftrightarrow368-27=\frac{a+350}{a}+315\)

\(\Leftrightarrow\frac{a+350}{a}+315=341\)

\(\Leftrightarrow\frac{a+350}{a}=26\)

\(\Leftrightarrow a+350=a.26\)

\(\Leftrightarrow350=a.26-a\)

\(\Leftrightarrow a.\left(26-1\right)=350\)

\(\Leftrightarrow a.25=350\)

\(\Leftrightarrow a=14\)

b, 92 : 4 - 27 = \(\dfrac{x+350}{x}\) + 315

   23 - 27       = 1 + \(\dfrac{350}{x}\) + 315

         316 + \(\dfrac{350}{x}\) = -4

                  \(\dfrac{350}{x}\) = - 316  - 4

                  \(\dfrac{350}{x}\) = -320

           -320 \(x\)   = 350

                     \(x\) = 350: (-320)

                   \(x\) = - \(\dfrac{35}{32}\) (loại)

Vậy \(x\) \(\in\)  \(\varnothing\) 

c, 720 : [ 41 - (2\(x\) - 5)] = 2³.5

             41 - (2\(x\) - 5)   = 720 : (2³.5)

              41 - 2\(x\) + 5   = 18

              46 - 2\(x\)         =18

                      2\(x\)        = 46 - 18

                      2\(x\)       = 28

                        \(x\)       = 28: 2

                        \(x\)       = 14

Vậy \(x\) = 14

dạ em cảm ơn cô

a) \(697:\frac{15a+364}{a}=17\)

\(\Rightarrow\frac{15a+364}{a}=697:17\)

\(\Rightarrow\frac{15a+364}{a}=41\)

\(\Rightarrow15a+364=41a\)

\(\Rightarrow364=26a\Rightarrow a=364:26\)

\(\Rightarrow a=14\)

b)

\(368-27=\frac{a+350}{a}+315\)

\(341=\frac{a+350}{a}+315\)

\(\left(a+350\right):a=341-315\)

\(\left(a+350\right):a=26\)

\(a+350=26a\)

\(\Rightarrow350=25a\)

\(\Rightarrow a=14\)

các bạn làm dễ hiểu phết

15.A+364A=697:1715.A+364A=697:17

15.A+364A=4115.A+364A=41

15+364A=4115+364A=41

364A=41−15364A=41−15 

364A=26364A=26

A=364:26A=364:26

A=14A=14