Даю 35 баллов!

Знайти значення виразу


[tex]71 {}^{2} - 29 {}^{2} [/tex]
[tex]1.7 {}^{2} - 0.7 {}^{2} [/tex]
[tex]( \frac{7}{11}) {}^{2} - ( \frac{4}{11} ) {}^{2} [/tex]
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