Question 981276

{{{sqrt(18)+ sqrt( 8)- sqrt(72)}}}

{{{sqrt(2*9)+ sqrt( 2*4)- sqrt(2*4*9)}}}

{{{3sqrt(2)+ 2sqrt( 2)- 2*3sqrt(2)}}}

{{{5sqrt( 2)- 6sqrt(2)}}}

{{{(5- 6)sqrt(2)}}}

{{{- sqrt(2)}}}