1. √80 - √50 + √27 - √81
= √16 × 5 - √25 × 2 + √9 × 3 - 9
= 4√5 - 5√2 + 3√3 -9
2. √625 + √243 - √81
= 25 + √81 × 3 - 9
= 25 + 9√3 - 9
= 16 + 9√3
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1. √80 - √50 + √27 - √81
= √16 × 5 - √25 × 2 + √9 × 3 - 9
= 4√5 - 5√2 + 3√3 -9
2. √625 + √243 - √81
= 25 + √81 × 3 - 9
= 25 + 9√3 - 9
= 16 + 9√3