[tex] \frac{ \sqrt{28} + \sqrt{63} + \sqrt{112} }{ \sqrt{7} + \sqrt{175} } = [/tex]

√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
=3/2
=1 1/2

Semoga bisa membantu...