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1) ![sqrt{7-4 sqrt{3} } + sqrt{7+4 sqrt{3} }= sqrt{4-4 sqrt{3}+3 } + sqrt{4+4 sqrt{3} +3}= sqrt{7-4 sqrt{3} } + sqrt{7+4 sqrt{3} }= sqrt{4-4 sqrt{3}+3 } + sqrt{4+4 sqrt{3} +3}=](https://tex.z-dn.net/?f=+sqrt%7B7-4+sqrt%7B3%7D+%7D+%2B+sqrt%7B7%2B4+sqrt%7B3%7D+%7D%3D+sqrt%7B4-4+sqrt%7B3%7D%2B3+%7D+%2B+sqrt%7B4%2B4+sqrt%7B3%7D+%2B3%7D%3D+++)
![sqrt{2 ^{2}-4 sqrt{3}+( sqrt{3} ) ^{2} } + sqrt{2 ^{2}+4 sqrt{3} +( sqrt{3}) ^{2} } = sqrt{(2- sqrt{3}) ^{2} } + sqrt{2 ^{2}-4 sqrt{3}+( sqrt{3} ) ^{2} } + sqrt{2 ^{2}+4 sqrt{3} +( sqrt{3}) ^{2} } = sqrt{(2- sqrt{3}) ^{2} } +](https://tex.z-dn.net/?f=+sqrt%7B2+%5E%7B2%7D-4+sqrt%7B3%7D%2B%28+sqrt%7B3%7D+%29+%5E%7B2%7D+++%7D+%2B+sqrt%7B2+%5E%7B2%7D%2B4+sqrt%7B3%7D+%2B%28+sqrt%7B3%7D%29+%5E%7B2%7D+++%7D+%3D+sqrt%7B%282-+sqrt%7B3%7D%29+%5E%7B2%7D++%7D+%2B+)
![sqrt{(2+ sqrt{3} ) ^{2} }=2- sqrt{3}+2+ sqrt{3} =4 sqrt{(2+ sqrt{3} ) ^{2} }=2- sqrt{3}+2+ sqrt{3} =4](https://tex.z-dn.net/?f=+sqrt%7B%282%2B+sqrt%7B3%7D+%29+%5E%7B2%7D+%7D%3D2-+sqrt%7B3%7D%2B2%2B+sqrt%7B3%7D+%3D4++)
2)![sqrt{11-4 sqrt{7} } + sqrt{11+4 sqrt{7} }= sqrt{4-4 sqrt{7}+7 } + sqrt{4+4 sqrt{7}+7 } = sqrt{11-4 sqrt{7} } + sqrt{11+4 sqrt{7} }= sqrt{4-4 sqrt{7}+7 } + sqrt{4+4 sqrt{7}+7 } =](https://tex.z-dn.net/?f=+sqrt%7B11-4+sqrt%7B7%7D+%7D+%2B+sqrt%7B11%2B4+sqrt%7B7%7D+%7D%3D+sqrt%7B4-4+sqrt%7B7%7D%2B7+%7D+%2B+sqrt%7B4%2B4+sqrt%7B7%7D%2B7+%7D+%3D+)
![sqrt{2 ^{2}-4 sqrt{7}+( sqrt{7} ) ^{2} } + sqrt{2 ^{2} +4 sqrt{7}+( sqrt{7}) ^{2}} = sqrt{(2- sqrt{7}) ^{2} }+ sqrt{2 ^{2}-4 sqrt{7}+( sqrt{7} ) ^{2} } + sqrt{2 ^{2} +4 sqrt{7}+( sqrt{7}) ^{2}} = sqrt{(2- sqrt{7}) ^{2} }+](https://tex.z-dn.net/?f=+sqrt%7B2+%5E%7B2%7D-4+sqrt%7B7%7D%2B%28+sqrt%7B7%7D+%29+%5E%7B2%7D+%7D+%2B+sqrt%7B2+%5E%7B2%7D+%2B4+sqrt%7B7%7D%2B%28+sqrt%7B7%7D%29+%5E%7B2%7D%7D+%3D+sqrt%7B%282-+sqrt%7B7%7D%29+%5E%7B2%7D++%7D%2B++)
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