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
Răspunsuri la întrebare
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