1 пример(3V3 + 2V7+V21+6)(3V3+2V7-V21-6) 2 пример(4V5-4-V55+V11)(4V5+4+V55+V11)где...

Решите задачу:

$(3 \sqrt{3} + 2 \sqrt{7}+ \sqrt{21} +6)(3\sqrt{3} +2 \sqrt{7}-\sqrt{21} -6) = \\\ =(3\sqrt{3} +2 \sqrt{7})^2-(\sqrt{21} +6)^2= \\\ =27+28+12 \sqrt{21} -21-36-12 \sqrt{21} =-2$

$(4 \sqrt{5}+ \sqrt{11}-4- \sqrt{55}})(4 \sqrt{5}+ \sqrt{11}+4+ \sqrt{55})= \\\ =(4\sqrt{5}+ \sqrt{11})^2-(4+ \sqrt{55})^2= 80+11+8 \sqrt{55} -16-55-8 \sqrt{55}= \\\ =20$

$(4 \sqrt{7}-\sqrt{119}-4\sqrt{3}+\sqrt{51})(4\sqrt{7}+\sqrt{51}+\sqrt{119}+4\sqrt{3})= \\\ (4\sqrt{7}+\sqrt{51})^2-(\sqrt{119}+4\sqrt{3})^2= \\\ =112+51+8 \sqrt{357} -119-48-8\sqrt{357} =-4$