Determinati a+b+c, astfel incat:

ab + bc + ca = 88


Răspuns :

ab+ bc+ca=88

10a+b + 10b +c + 10c +a =88

10(a+b+c) +(a+b+c) =88

(a+b+c) (10+1)=88

a+b+c=88:11

a+b+c=8


succes xoxo

ab + bc + ca = 88

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10a + b + 10b+ c+ 10c + a = 88

10( a + b + c ) + ( a + b + c ) = 88

( a + b + c ) ( 10 + 1 ) = 88

a + b + c = 88 : 11

a + b + c = 8