Evaluate: $$ {9।3-5।-5।-5।4।÷10\over-3(5)-2×4÷2}$$

The value of 24 ÷ 4 ×(3 +3) ÷2 is:

$$ (17)^{2} + 6 × (13)^{2}-212×6$$

Simplify : $$\sqrt{[(12.1)^2-(8.1)^2]÷[(0.25)^2+(0.25)(19.95)]} $$

$$\sqrt{x}÷ \sqrt{144} = 0.02, $$ then the value of x is 

1-[5-{2+(-5+6-2)2}] is equal to 

If $$ {3\sqrt{{1-a}\over{a}}}+9={19-3\sqrt{{a}\over{1-a}}}$$, then what is the value of a?

Direction: what should come in place at question mark(?).

45% of 224×?% of 120=8104.32