1.=2√3×√3-2√3×2√2-5√2×√3+5√2×2√2 =6-4√6-5√6+20 =26-11√6 2.=√3/3×√2/2-√3/3×√3-√2×√2/2+√2×√3 =√6/6-1-1+√6 =六分之七根号六-2