a. If B is opposite to each other, C and D are reciprocal to each other, and the absolute value of X is equal to twice of its opposite number, then x & sup2; + ABCD + (a + b) CD =?

From the title we know that a + B = 0. CD = 1
So ABCD = 0, (a + b) CD = 0
When x is a positive number, there is x = - 2x, the equation is contradictory, so it is abandoned
When x is negative, - x = - 2x, the equation is contradictory, so it is abandoned
So x = 0
So x & sup2; + ABCD + (a + b) CD = 0

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