х²=0,49
х=√0,49=0,7 и х=-0,7
х²=11 х=√11 и х=-√11
х²=8
х=√8=2√2 и х=-2√2
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х²=0,49
х=√0,49=0,7 и х=-0,7
х²=11 х=√11 и х=-√11
х²=8
х=√8=2√2 и х=-2√2