378.35 + 478 ÷ 12.5 =?

74.2% of 7685.4 +?% of 5546.8 = 6750

54.35 × 39.87 ÷ 13.35 =?

If x=√3+1/√3-1and y=√3-1/√3+1,then the value of (x² + y²) is:

(94)² + (?)² = (145)²- (56)²- 3869