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= √(4.2) + √(25.3) - (√(16.2) + √(81.3)
= 2√2 + 5√3 - 4√2 + 9√3
= 2√2 - 4√2 + 5√3 + 9√3
= -2√2 + 14√3
atau
= -2.(√2-7√3)
= 2√2 + 5√3 - (4√2 + 9√3)
= 2√2 - 4√2 + 5√3 - 9√3
= - 2√2 - 13√3
semoga membantu ya :)