Question

3 Calculează 5 x a - 2 x b + c, ştiind că: a = 6 x 7 - 5 x 6 - 72:9, b = 64 : 8 +3 x 4 - 4x4, c= 3 x 8:6 x 5.​

Answer 1

Răspuns: 32

Explicație pas cu pas:

a = 6 × 7 - 5 × 6 - 72 : 9

a = 42 - 30 - 8

a = 12 - 8

a = 4

_______________________

b = 64 : 8 + 3 × 4 - 4 × 4

b = 8 + 12 - 16

b = 20 - 16

b = 4

________________

c =3 × 8 :  6 × 5

c = 24 : 6 × 5

c = 4 × 5

c = 20

____________________

5 × a - 2 × b + c = 32

= 5 × 4 - 2 × 4 + 20 =

= 20 - 8 + 20 =

= 12 + 20 =

= 32

Answer 2

Răspuns:

Explicație pas cu pas:

a = 6×7-5×6-72:9; a = 42-30-8 ; a = 4

b = 64:8+3×4-4×4 ; b = 8+12-16 ; b = 4

c = 3×8:6×5 ; b = 24:6×5; b = 4×5; b = 20

5×a-2×b+c = 5×4-2×4+20 = 20-8+20 = 12+20 = 32