2 akar 175 – 5 akar 543 + akar 63 – 3 akar 112

2√175 – 5√543 + √63 – √112
=2√(25×7) – 5√543 + √(9×7) – √(16×7)
=(2×5)√7 – 5√543 + 3√7 – 4√7
=10√7 – 5√543 + 3√7 – 4√7
=(10+3–4)√7 – 5√543
=9√7 – 5√543