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= √4.√5 + √9.√5 + √49.√5 / √16.√5
= 2√5 + 3√5 + 7√5 / 4√5
= 12√5 / 4√5
= 3√5
2. √28 + √63 + √112 / √7 + √175
= √4.√7 + √9.√7 + √16.√7 / √7 + √25.√7
= 2√7 + 3√7 + 4√7 / √7 + 5√7
= 9√7 / 6√7
= 3√7 / 2√7