1. Simplify : \(\frac{0.88\times0.88- 0.87\times0.87}{0.88+0.87}\)

1.   \(\frac{{(2\frac{2}{3}+1\frac{1}{3})}^{3}}{{(4\frac{1}{4}+3\frac{3}{4})}^{2}}\)  is equal to

1.   \(\frac{3.7\times3.7\times3.7+ 3.3\times3.3\times3.3 + 3\times3\times3-3\times3.7\times3.3\times3}{3.7\times3.7+3.3\times3.3+3\times3-3.7\times3.3-3.3\times3-3.7\times3}\)   is equal to

1. Subtracting \(3\frac{5}{8}\)  from \(5\frac{160}{240}\)  we get

1 ÷ \(\frac{1}{1\div\frac{1}{1\div2}}\)   = ?

1. 3475 × 0.999 is

\((\sqrt{2}-\frac{1}{\sqrt{2}})^{2}\) = ?

1. The value of \(\frac{1}{2}+\frac{1}{2\times3}+\frac{1}{2\times3\times4}+\frac{1}{2\times3\times4\times5}\)  up to three places of decimal is

1. When simplified the product  \(\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)\left(1-\frac{1}{5}\right)......\left(1-\frac{1}{n}\right)\)  equals

1. The sum and product of two numbers is 8 and 15 respectively. The sum of their reciprocals is