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一、选择题 (每小题 6分 ,共 3 6分 )1 若ｘ -2 +ｙ +3 =0 ,则 ｙｘ 的值是 ( ) .(Ａ) 32 (Ｂ) 23 (Ｃ) -32 (Ｄ) -232 若ａ、ｂ为实数 ,则下列命题中正确的是 ( ) .(Ａ)ａ ｂ ａ2 ｂ2 (Ｂ)ａ≠ｂ ａ2 ≠ｂ2(Ｃ) |ａ|ｂ ａ2
First, multiple-choice questions (6 points for each question, a total of 3 6 points) 1 If x -2 +y +3 =0, the value of yx is ().(A) 32 (B) 23 (C) -32 ( D) -232 If a and b are real numbers, the correct one of the following propositions is (). (A) a b a2 b2 (B) a≠b a2 ≠b2 (C) |a|b a2