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= √4.2 - √4.5 + 3√9.5 - √36.2
= 2√2 - 2√5 + 3.3√5 - 6√2
= 2√2 - 2√5 + 9√5 - 6√2
= 2√2 - 6√2 - 2√5 + 9√5
= -4√2 + 7√5
b. (3√6 + 6√5) (3√6 - 6√5)
= 9.6 - 18√30 + 18√30 - 36.5
= 54 - 180
= -126
Semoga Bermanfaat :)