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a:b=7:13, a=7b13, 1a=137b;把1a=137b代人1a−1b=1182,得,137b−1b=1182, 67b=1182, 7b=182×6, b=156;把b=156代人a=7b13中,a=7b13=7×15613=84;所以a+b=84+156=240.故答案為:240.
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