please tell me answer
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3√2+5√2= 8√2; 3√2-3√2=0; 3√2+7√2=10√2
5√2+5√2=10√2; 5√2-3√2=2√2; 5√2+7√2=12√2
10√2+5√2=15√2; 10√2-3√2=7√2; 10√2+7√2= 17√2.
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