Question

calculați A și B din expresie data apoi aflați:

Answer 1

Răspuns:

Explicație pas cu pas:

a)  

8 × { 212 - 5 x [ a + 3 × ( 5 × 6 - 17 ) ] } = 96

212 - 5 x [ a + 3 × ( 30 - 17 ) = 96 : 8

212 - 5 × ( a + 3 × 13 ) = 12

5 × ( a + 39 ) = 212 - 12

5 × ( a + 39 ) = 200

a + 39 = 200 : 5

a + 39 = 40

a = 40 - 39

a = 1

______________________

b)

b = 3 + 2 × [ 3 + 2 × ( 3 + 3 ) ]

b = 3 + 2 × ( 3 + 2 × 6 )

b = 3 + 2 × ( 3 + 12 )

b = 3 + 2 × 15

b = 3 + 30

b = 33

__________________

2 × ( a + b ) - 2 × a × b = 2

= 2 × ( 1 + 33 ) - 2 × 1 × 33 =

= 2 × 34 - 2 × 33 =

= 68 - 66 =

= 2  

Answer 2

8 × { 212 - 5 × [ a + 3 × ( 5 × 6 - 17 ) ] } = 96

8 × { 212 - 5 × [ a + 3 × ( 30 - 17 ) ] } = 96

8 × [ 212 - 5 × ( a + 3 × 13 ) ] = 96

8 × [ 212 - 5 × ( a + 39 ) ] = 96

[ 212 - 5 × ( a + 39 ) ] = 96 : 8

[ 212 - 5 × ( a + 39 ) ] = 12

[ 5 × ( a + 39 ) ] = 212 - 12

[ 5 × ( a + 39 ) ] = 200

a + 39 = 200 : 5

a + 39 = 40

a = 40 - 39

a = 1

b = 3 + 2 × [ 3 + 2 × ( 3 + 3 ) ]

b = 3 + 2 × ( 3 + 2 × 6 )

b = 3 + 2 × ( 3 + 12 )

b = 3 + 2 × 15

b = 3 + 30

b = 33

2 × ( 1 + 33 ) - 2 × 1 × 33 =

2 × 34 - 2 × 33 =

68 - 66 = 2