(1-корень из2)(3+корень из 2)

1) 3+[latex] \sqrt{2} [/latex]-3[latex] \sqrt{2} [/latex]-2= 1-2[latex] \sqrt{2} [/latex]; 2) 2*3-[latex] \sqrt{7*3} [/latex]+2[latex] \sqrt{3*7} [/latex]-7=6-[latex] \sqrt{21} [/latex]+2[latex] \sqrt{21} [/latex]-7=[latex] \sqrt{21} [/latex]-1; 3) 2[latex] \sqrt{7*12} [/latex]-2*7+12-[latex] \sqrt{7*12} [/latex]-[latex] \sqrt{84} [/latex]= [latex] \sqrt{84} [/latex]-2-[latex] \sqrt{84} [/latex]= -2