After interchanging the given two signs, what will be the value of the following expression?

× And ÷

20 + 5 ÷ 6 × 2 – 5

If x = 222, y = 223 and z = 224, then find the value of x³+y³+z³-3xyz

If a³ – b³ – c³ – 3abc = 0, then 

$$ {4\over 7}×{2{4\over 5}} ÷{2\over 5}=?$$

If the sum of {a\over b}and its reciprocal is 1 and a ≠ 0, b ≠ 0, then the value of a³ + b³ is

$$ if \ {1\over x}+x=4,$$ then find $${1\over x^2}+x^2$$

If p – 2q = 4, then the value of p³ – 8q³ – 24pq – 64 is :

If $${b\over a}=0.7$$ find the value of $${a-b\over a+b}={11\over34}.$$