Question 651434
1){{{7-3/sqrt(7)+2}}} 

={{{9-3/2.646}}}

={{{9-1.134}}}

={{{7.866}}}



2) {{{2sqrt(3)/ sqrt(3) - 3sqrt(2)}}}

={{{2cross(sqrt(3))/ cross(sqrt(3)) - 3sqrt(2)}}}

={{{2 - 3(1.41)}}}

={{{2-4.23}}}

={{{-2.23}}}



3) {{{2sqrt(2) - 3sqrt(7)/3sqrt(2) +2sqrt(7)}}}

{{{2(1.41) - 3(2.646)/3(1.41) +2(2.646)}}}

{{{2(1.41) - cross(3)(2.646)/cross(3)(1.41) +2(2.646)}}}

{{{2(1.41) - 2.646/1.41 +2(2.646)}}}

{{{2.82 -1.876 +5.292}}}

{{{0.944+5.292}}}

{{{6.236}}}


{{{6.236}}}



3) {{{5sqrt(3) -4sqrt(5)/ 2sqrt(5) +3sqrt(3)}}}

{{{5(1.73) -cross(4)2(2.236)/ cross(2)(2.236) +3(1.73)}}}

{{{8.65 -4.472/(2.236) +5.199}}}

{{{13.849 -2}}}

{{{11.85 }}}



4) {{{sqrt(a) + sqrt(b)/ sqrt(a) -sqrt(b)}}}...in case you have this


 {{{(sqrt(a)*sqrt(a) + sqrt(b) -sqrt(b)*sqrt(a))/sqrt(a)}}}


{{{(a + sqrt(b) -sqrt(ab))/sqrt(a)}}}

but, ...in case you have this

{{{(sqrt(a) + sqrt(b))/ (sqrt(a) -sqrt(b))}}}


{{{((sqrt(a) + sqrt(b))(sqrt(a) +sqrt(b)))/ ((sqrt(a) -sqrt(b))(sqrt(a) +sqrt(b)))}}}

{{{(((sqrt(a))^2 + sqrt(a)sqrt(b)+(sqrt(b))^2+sqrt(a)sqrt(b)))/ ((sqrt(a))^2 -(sqrt(b)^2))}}}

{{{(((sqrt(a))^2 + 2sqrt(a)sqrt(b)+(sqrt(b))^2))/ (a -b))}}}


{{{(sqrt(a) + sqrt(b))^2/ (a -b))}}}