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Va rog ,exercitiul 6,c,e,f

Va Rog Exercitiul 6cef class=

Răspuns :

6c)
a+b+c=7
a×13+b×13+c×13+21=13(a+b+c)+21=13×7+21=112

6e)
a+b+c=7
400-5a+5b+5c=400-5(a+b+c)=400-5×7=400-35=365

6f)
a+b+c=7
6a+6b+6c+100=6(a+b+c)+100=6×7+100=42+100=142