daca a.b-a×c+a×d=910 si a=7 calculati b-c+d va rog rapid dau coroana!!
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Răspuns:
a×b-a×c+a×d=910
a×(b-c+d)=910
a=7
7×(b-c+d)=910
b-c+d=910:7
b-c+d=130