simplify: 3root45- root125 +root200 - root50
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3√45-√125+√200-√50
=3×3√5-5√5+10√2-5√2
=√5(9-5)+√2(10-5)
=4√5+5√2
=3×3√5-5√5+10√2-5√2
=√5(9-5)+√2(10-5)
=4√5+5√2
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