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a²;-b²;=45 (a+b)(a-b)=45 因為45=1×45=3×15=5×9 所以有三種情况 a+b=45 a-b=1 解得a=23,b=22 a+b=15 a-b=3 解得a=9,b=6 a+b=9 a-b=5 解得a=7,b=2
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