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$�� 6.2. �� :�) {3a+4b=11, 5a-2b=27}; �) {5a-4b=-12, 7a+9b=100};�) {a^2+b^2=13, a^2-b^2=-5}; �) {2a^2+b^2=19,...$

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6.2. �� :

�) {3a+4b=11, 5a-2b=27}; �) {5a-4b=-12, 7a+9b=100};

�) {a^2+b^2=13, a^2-b^2=-5}; �) {2a^2+b^2=19, 2a^2-b^2=17};

�) {3a^2-2b^2=-5, 6a^2-3b^2=-6}; �) {2a^2+5b^2=37, 5a^2-3b^2=77}.

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