Х²-у²=64
х+у=2, у=2-х
(х-у)(х+у)=64
2(х-у)=64
х-у=32
х=32+у
у=2-(32+у)
у=2-32-у
2у=-30
у=-15
х=32+(-15)=17
Ответ: 17 и -15
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2)3m</span>²3n3k²+0.3m²k²n-5k²nm²=3m²3n3k²-4.7m²k²n
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<span>3) √0,9=0,3..................</span>