Question

Află valoarea necunoscutei
9x[3+4x(15+6xa):18]=81​

Answer 1

Răspuns:

Explicație pas cu pas:

9 x [ 3 + 4 x ( 15 + 6 x a) : 18 ] = 81

3 + 4 x ( 15 + 6 x a ) : 18 = 81 : 9

3 + 4 x ( 15 + 6 x a) :18 = 9

4 x ( 15 + 6 x a) : 18 = 9 - 3

4 x ( 15 +6 x a) : 18 = 6

4 x ( 15 + 6 x a) = 6 x 18

4 x ( 15 + 6 x a) = 108

( 15+ 6 x a) = 108 : 4

15 + 6 x a=27

6 x a =27 - 15

6 x a =12

a=12 :6

a= 2

Answer 2

9 × [ 3 + 4 × ( 15 + 6 × a ) : 18 ] = 81

[ 3 + 4 × ( 15 + 6 × a ) : 18 ] = 81 : 9

3 + 4 × ( 15 + 6 × a ) : 18 = 9

4 × ( 15 + 6 × a ) : 18 = 9 - 3

4 × ( 15 + 6 × a ) : 18 = 6

4 × ( 15 + 6 × a ) = 6 × 18

4 × ( 15 + 6 × a ) = 108

15 + 6 × a = 108 : 4

15 + 6 × a = 27

6 × a = 27 - 15

6 × a = 12

a = 12 : 6

a = 2