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Se știe că a+b+c=7.Claculați:
A. 2a+2b+2c
B. 10a+10b+10c
C.13a+13b+13c+21
D.8a+8b+8c-12
E.400-(5a+5b+5c)
F.6a+6b+6c+100


Răspuns :

Răspuns:

Explicație pas cu pas:

a + b + c = 7

a )

2a + 2b + 2c =

2 × ( a + b + c ) =

2 × 7 = 14

b )

10a + 10b + 10c =

10 × ( a + b + c ) =

10 × 7 = 70

c )

13a + 13b + 13c + 21 =

13 × ( a + b + c ) + 21 =

13 × 7 + 21 =

91 + 21 = 112

d )

8a + 8b + 8c - 12 =

8 × ( a + b + c ) - 12 =

8 × 7 - 12 =

56 - 12 = 44

e )

400 - ( 5a + 5b + 5c ) =

400 - [ 5 × ( a + b + c ) ] =

400 - ( 5 × 7 ) =

400 - 35 = 365

f )

6a + 6b + 6c + 100 =

6 × ( a + b + c ) + 100 =

6 × 7 + 100 =

42 + 100 = 142

A. 2 a + 2 b + 2 c =

2 × ( a + b + c ) =

2 × 7 = 14

B. 10 a + 10 b + 10 c =

10 × ( a + b + c ) =

10 × 7 = 70

C. 13 a + 13 b + 13 c + 21 =

13 × ( a + b + c ) + 21 =

13 × 7 + 21 =

91 + 21 = 112

D. 8 a + 8 b + 8 c - 12 =

8 × ( a + b + c ) - 12 =

8 × 7 - 12 =

56 - 12 = 44

E. 400 - ( 5 a + 5 b + 5 c ) =

400 - [ 5 × ( a + b + c ) ] =

400 - ( 5 × 7 ) =

400 - 35 = 365

F. 6 a + 6 b + 6 c + 100 =

6 × ( a + b + c ) + 100 =

6 × 7 + 100 =

42 + 100 = 142