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If a+b=5+5a + b = 5 + 5a+b=5+5 and 1a+1b=15+15,\displaystyle \frac 1a + \frac 1b = \frac15 + \frac15,a1+b1=51+51, is it necessarily true that a×b=5×5?a\times b = 5\times5?a×b=5×5?
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