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ANSWER: - 3√5
Step-by-step explanation:
√45 + √80 - ³√20
∴ √5×9 + √4 × 20 - ³√5 × 4
∴ 3√5 + 2√20 × - 2³√5
∴ 3√5 + 2√5×4 × - 2³√5
∴ 3√5 + 4×2√5 × - 2³√5
∴ 3√5 + 8√5 × - 2³√5
∴ 3√5 + 8√5 × - 8√5
∴ (3 + 8 - 8)√5
∴ 3√5
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