[f(a^(2)+b^(2))x^(2)+2(ab+bi)x+r^(2)+d^(...

[f(a^(2)+b^(2))x^(2)+2(ab+bi)x+r^(2)+d^(2)=0" has noreal roots,then "],[[" a) "ard=bc," (b) "a'(c),m=bd," (d) "ad],[" (b) "b=," 3"(2x-1)" is "2" ercon then "]]

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