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12√18-6√20-3√50+8√45
= 36√2-12√5-15√2+24√5
= 3( 12√2-4√5-5√2+8√5)
= 3( 12√2-5√2-4√5+8√5)
= 3( 7√2+4√5)
= 21√2 + 12√5
= 36√2-12√5-15√2+24√5
= 3( 12√2-4√5-5√2+8√5)
= 3( 12√2-5√2-4√5+8√5)
= 3( 7√2+4√5)
= 21√2 + 12√5
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