(2x^2-3x-2)+(x^2-5x+6)i的实数解x=? 如果z=a^2+a-2+(a^2-3a+2)i为纯虚数,那么实数a的值为?求带过程的,告诉我方法的就不麻烦了,谢谢.第一题是这样的.方程(2x^2-3x-2)+(x^2-5x+6)i=0 的实数解 x=?

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