What should come in place of the question mark(?) in this question?

168 ÷ 14 ÷ 3 = ?

What should come in place of the question mark(?) in this question?

556 - 441 + 223 - 112 = ?

What should come in place of the question mark(?) in this question?

? X 7/12 X 5/7 X 1/2 = 2500

What should come in place of the question mark(?) in this question?

( √5 – 1)² = ? – 2√5

What should come in place of the question mark(?) in this question?

5² X 255 ÷  5 - 1116 = ?

What should come in place of the question mark(?) in this question?

5² X 25³  X 625 = (5)?