Question

3.Se dau numerele : a = 6 x 7 – 5 x 6 – 72 : 8
b = 64 : 8 + 3 x 4 – 4 x 4
c = 42 : 6 – 16 : 8
Calculează : 3 x a – 2 x b + c

Answer 1

Răspuns:

6

Explicație pas cu pas:

a=6×7-5×6-72:8

a=42-30-9

a=12-9

a=3

b=64:8+3×4-4×4

b=8+12-16

b=20-16

b=4

c=42:6-16:8

c=7-2

c=5

Calculăm:

3×a-2xb+c=

3×3-2×4+5=

9-8+5=

1+5=

6

Answer 2

Salutare!

$\bf a = 6\cdot 7 -5\cdot 6 - 72 : 8$

$\bf a = 42 -30 - 9$

$\boxed{\bf a =3}$

$\bf b = 64 : 8 + 3\cdot 4 -4\cdot4$

$\bf b = 8 + 12 -16$

$\bf b = 20 -16$

$\boxed{\bf b = 4}$

$\bf c= 42 : 6 -16:8$

$\bf c= 7 -2$

$\boxed{\bf c= 5}$

$\bf 3\cdot a- 2\cdot b + c = 3\cdot 3- 2\cdot4 + 5$

$\bf 3\cdot a- 2\cdot b + c = 9 - 8 + 5$

$\boxed{\bf 3\cdot a- 2\cdot b + c = 6}$