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Se stie ca a+b+c=7.Calculati
a)2a+2b+2c
d)8a+8b+8c-12
f)400-(5a+5b+5c)


Răspuns :

pai vine.... daca a+b+c = 7 atunci 2a+2b+2c = 2x7asta la a....
a)se da factor comun:2(a+b+c)=2x7=14
d)8(a+b+c)-12=(8x7)-12=56-12=44
f)400-5(a+b+c)=400-(5x7)=400-35=365