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Se stie ca a+b+c=7.Calculati:
A) 2a+2b+2c
B)10a+10b+10c
C)a x(ori) 13+b x (ori)13 +c x(ori) 13+21
D)8a+8b+8c-12
E) 400-(5a+5b+5c)
F) 6a+6b+6c+100

Este cu factor comun. Sunt in clasa a5-a

Răspuns :

A)2a+2b+2c=2x(a+b+c)=2x7=14 B)10a+10b+10c=10x(a+b+c)=10x7=70 C)13a+13b+13c+21=13x7+21=91+21=112 D)8ax8bx8c-12=8x7-12=56-12=44 E)400-(5a+5b+5c)=400-5x7=400-35=365 F)6a+6b+6c+100=6x7+100=42+100=142

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