(10) The original formula = √125 * 5-√ 20 * 5 = √ 625-√100 = 25-15.

(1 1) Original formula =√8+√ 18=2√2+3√2=5√2.

(12) Original formula = (√ 2-1) (√ 2-1) (√ 2-1) (3+2 √ 2).

=(3-2√2)(3-2√2)(3+2√2)=(9-8)(3-2√2)=3-2√2

(13) Original formula = 2 * √ 2 * √ 2/4+3 √ 6 = √ 6+3 √ 6 = 4 √ 6.

(14) Original formula = 6-2 √ 3-5 √ 3+5 =11-7 √ 3.

(15) Original formula = 12-6=6.

(16) The original formula =1/4+1.25-1+1/2 =1.