Simplify and express the result as a rational number in its lowest form `(0.4xx0.04xx0.005)/(0.1xx10xx0.001)-1/2+1/5`

Simplify and express each of the following in exponential form: 2^(0)xx3^(0)xx4^0

0.04xx0.04xx0.04= ?

Simplify and express each of the following in exponential form: 2^0xx3^0xx4^0

0.4 xx 0.4 xx 0.4 = ?

Solve the following expressions and express the result to an appropriate number of significant figures : (i) 65.5xx135.1xx0.61 (ii) (4.23xx25.68)/(658.2) (iii) (3.51xx10^(-4)xx2.71xx10^(7))/(0.5562) .

Simplify 10.1xx0.1xx0.1