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Doar ex 12 plssssss helllllp meee

Doar Ex 12 Plssssss Helllllp Meee class=

Răspuns :

a+b=13

a=3

b=10

3×5+7×3+7×10=15+21+70=106

a)3x+7a+7b=>15+7(a+b)=>

=>15+7*13=

15+91=106

c) 10x+(4a+4b)=

50+[4(a+b)]=

50+(4*13)=

50+52=102