Question

Stiind ca:

A=(9+8:2-9:3):2
B=7-15:(8-6:2)
C=(8+16):3+3x(18-4x3)

Calculati:5xa+3xb-c=
8xa+6xb-2xc=



Dau coroana !

Va rog.

Answer 1

Răspuns:

Explicație pas cu pas:

A=(9+8:2-9:3):2 = (9 + 4 - 3) : 2 = 10 : 2 = 5

B=7-15:(8-6:2) = 7 - 15 : (8 - 3) = 7 - 15 : 5 = 7 - 3 = 4

C=(8+16):3+3x(18-4x3) = 24 : 3 + 3(18 - 12) = 8 + 3x6 = 8 + 18 = 26

5a + 3b - c = 25 + 12 - 26 = 11

8a + 6b - 2c = 40 + 24 - 52 = 12

Answer 2

Răspuns:

Explicație pas cu pas:

a = ( 9 + 8 : 2 - 9 : 3 ) : 2

a = ( 9 + 4 - 3 ) : 2

a = ( 13 - 3 ) : 2

a = 10 : 2

a = 5

___________________

b = 7 - 15 : ( 8 - 6 : 2 )

b = 7 - 15 : ( 8 - 3 )

b = 7 - 15 : 5

b = 7 - 3

b = 4

____________________

c = ( 8 + 16 ) : 3 + 3 x ( 18 - 4 x 3 )

c = 24 : 3 + 3 x ( 18 - 12)

c = 8 + 3 x 6

c = 8 + 18

c = 26

________________________________

5 × a + 3 × b - c = 11

= 5 × 5 + 3 × 4 - 26 =

= 25 + 12 - 26 =

= 37 - 26 =

= 11

__________________________________________________

8 × a + 6 × b - 2 × c = 12

= 8 × 5 + 6 × 4 - 2 × 26 =

= 40 + 24 - 52 =

= 64 - 52 =

= 12