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5ab+ab3+b7a=906...calculeaza suma cifrelor a si b.

Răspuns :

CarMina03
5x100+ax10+b+100xa+10xb+3+100xb+7x10+a=906
500+10a+b+100a+10b+3+100b+70+a=906
111a+111b=906-500-3-70
111(a+b)=333
a+b=333:111
a+b=3

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