Find the value of :

`(( 3. 9 )^2 - ( 1 . 7 )^2 ) / ( 3.9 - 1.7 )`

Find the value of 7/9 - 1/3

Find the value of ( -2 7/9 )^2

Find the value of -3/7+9/7

find the value of |[ 5 , 3 ] , [ 7, 9 ] |

Find the value of 1"" (7)/(9) + (5)/(12) + (7)/(18)

Find the value of a and b . (sqrt11 - sqrt7 ) / (sqrt 11 + sqrt 7) = a - b sqrt 77 (i) a = 9/2 , b = 1/2 (ii) a = 2/9, b = 2/3 (iii) a = 2/5, b = 1/2 (iv) a = 9/2, b =5/2

Find the value of 1/(4(2/7)) + 1/(3(11/13)) + 1/(5/9)

Find the value of x for which ((4)/(9)) ^(4) xx ((4)/(9)) ^(-7) = ((4)/(9)) ^(2x -1)