Question

8.Ştiind că:
a = c x 2, c=b:6,
să se calculeze: (a + b - c) xa;
b + b + b + b = 168,
(b + a): c xa;
(b:c+a) x a.​

Answer 1

Răspuns:

a = c x 2

a= 2c

c=b:6

c=b/6

b= 6c

(a + b - c) xa=

(2c+6c-c)×2c=

7c×2c=

14c^2

b + b + b + b = 168

4b=168

4×6c=168

24c=168 /:24

c= 7

(b + a): c xa

(6c+2c): c×2c=

8c/c×2c=

16c

(b:c+a) x a=

(6c:c+2c)×2c=

(6+2c)×2c=

12c+4c^2=

4c(3+c)

Explicație pas cu pas: