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A*(b+c)=640 si a*b=240 a*c=?

Răspuns :

ab+ac=640
240+ac=640
ac=640-240
ac=400
a×(b+c)=640; a×b=240; a×c=? a×b+a×c=640; 240+a×c=640; a×c=640-240; a×c=400