Question

86. Calculează: 2 x a - 2 xb + 2 x c, ştiind că:
a = (5 + 7:7 +2 - 2:2) x 20:14
b = [36 - 16:(35:7 - 12 : 3)]: 5 - 4
c = 7 + 3 x [2 - 27 :(5 x 5 + 2 : 1)]​

Answer 1

Răspuns:

a=(5+7:7 +2 - 2:2) x 20:14

a=(5+1+2-1)*20:14

a=7*20:14

a=140:14

a=10

b = [36 - 16:(35:7 - 12 : 3)]: 5 - 4

b=[36-16:(5-4)]:5-4

b=[36-16:1]:5-4

b=[36-16]:5-4

b=20:5-4

b=4-4

b=0

c = 7 + 3 x [2 - 27 :(5 x 5 + 2 : 1)]​

c=7+3*[2-27:(25+2)]

c=7+3*[2-27:27]

c=7+3*(2-1)

c=7+3

c=10

2*a-2*b+2*c=

2*10-2*0+2*10=

20+20=40

Answer 2

Răspuns:

Explicație pas cu pas:

a=(5+1+2-1)×20:14 a=7×20:14 a=140:14 a=10

b=[36-16:(5-4)]:5-4

b=(36-16:1):5-4

b=20:5-4

b=4-4 b=0

c=7+3×[2-27:(25+2)]

c=7+3×(2-27:27)

c=7+3×(2-1) c=7+3×1 c=10

iar acum inlocuiesti valorile aflate. nimic de a pui10. in loc de b pui0 ora in loc de c pui 10 si vine asa:

2×10-2×0+2×10=20-0+20=40