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=> √(16x3) + √(25x3) - √(49x3)
=> 4√3 + 5√3 - 7√3 = 2√3
1B. 6√72 - 6√8 - 20 + 3√45
=> 6√(36x2) - 6√(4x2) - √(4x5) + 3√(9x5)
=> 36√2 - 12√2 - 2√5 + 6√5 = 24√2 + 4√5 = 4(6√2 + √5)