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

Giải câu b:

92.4 - 27 = \(\frac{a+350}{a}\)+ 315

368 - 27 = \(\frac{a+350}{a}\)+ 315

341 = \(\frac{a+350}{a}\)+ 315

 \(\frac{a+350}{a}\)= 341 - 315

 \(\frac{a+350}{a}\)= 26

a + 350 = 26.a 

26a - 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.\(92.4-27=\frac{a+350}{a}+315\)

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

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

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

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

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

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

\(\Leftrightarrow a.25=350\)

\(\Leftrightarrow a=14\)

tịt???????????????????????????????????????___________________????????????????????????????????????????????????

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

\(\Rightarrow\frac{15X+364}{X}=697:17=41\)

\(\Rightarrow15X+364=41X\)

\(\Rightarrow364=41X-15X=26X\)

\(\Rightarrow X=14\)

THANKYOU.

A.suy ra: 15x+364/x=41

  suy ra: 15x/x+364/x=41

  suy ra: 15 + 364/x=41

  suy ra: 364/x        =26

  suy ra: 364:x=26

  suy ra: x= 14 (T/M)

B. 92.4-27=x+350/x+315

  suy ra: 341=x/x+ 350/x +315

  suy ra: 26 =1+350/x

  suy ra: 25=350/x

  suy ra: 350:25=x

  suy ra: 14=x (T/M)

Vậy a. x=14

       b. x=14