Question

vă rog să mă ajutați la exercițiile la matematică cu probă​

Answer 1

Răspuns:

exercițiu 2

22 - 5 × ( 38 - 4 × a ) = 12

22 - 12 = 5 × ( 38 - 4 × a )

10 = 5 × ( 38 - 4 × a )

10 : 5 = 38 - 4 × a

2 = 38 - 4 × a

4 × a = 38 - 2

4 × a = 36

a = 36 : 4

a = 9

proba

22 - 5 × ( 38 - 4 × 9 ) = 12

22 - 5 × ( 38 - 36 ) =

22 - 5 × 2 =

22 - 10 = 12

exercițiu 1

26 + ( 6 × a - 7 × 3 ) : 9 = 27

( 6 × a - 7 × 3 ) : 9 = 27 - 26

( 6 × a - 7 × 3 ) : 9 = 1

6 × a - 7 × 3 = 1 × 9

6 × a - 21 = 9

6 × a = 9 + 21

6 × a = 30

a = 30 : 6

a = 5

proba

26 + ( 6 × 5 - 7 × 3 ) : 9 =

26 + ( 30 - 21 ) : 9 =

26 + 9 : 9 =

26 + 1 = 27

exercițiu 3

11 - ( 7 × 5 - 9 × 9 : a : 3 ) : 8 = 7

11 - 7 = ( 7 × 5 - 9 × 9 : a : 3 ) : 8

4 = ( 35 - 9 × 9 : a : 3 ) : 8

4 × 8 = 35 - 9 × 9 : a : 3

32 = 35 - 81 : a : 3

81 : a : 3 = 35 - 32

81 : a : 3 = 3

81 : a = 3 × 3

81 : a = 9

a = 81 : 9

a = 9

proba

11 - ( 7 × 5 - 9 × 9 : 9 : 3 ) : 8 =

11 - ( 35 - 81 : 9 : 3 ) : 8 =

11 - ( 35 - 9 : 3 ) : 8 =

11 - ( 35 - 3) : 8 =

11 - 32 : 8 =

11 - 4 = 7