What is the value of `7(1)/(4)+[6+(5-8-:4)-1]?`

What is the value of (1/(sqrt(9) - sqrt(8)) - 1/(sqrt(8) - sqrt(7)) + 1/(sqrt(7) - sqrt(6)) - 1/(sqrt(6) - sqrt(5)) + 1/(sqrt(5) - sqrt(4))) ?

What is the value of ((5)/(7) of (19)/(6))/((19)/(7)/((7)/(4)))

What is the value of [(6.5)^(3)+(4.7)^(3)]div[(6.5)^(2)-6.5xx4.7+(4.7)^(2)]?

What is the value of 8 1/7+5 3/7+4 2/7+3 1/7

What is the value of (1xx 2 +2xx 3-3xx 4 +4xx 5 -5 xx 6 +6 xx 7) ?

If 6#30=5,8#24=3,7#28=4, then what is the value of 8#40=?