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一.选择题: 1 设a≠0,则下列运算中正确的是 (A)a~2·a~3=a~6; (B)(a~3)~2=a~9; (C)(a-1)~0=1; (D)a~2÷a~3=1/a 2 函数y=(x+1)~(1/2)/(x-1)中,自变量x的取值范围是 (A)x≥0; (B)x≠1; (C)x≥-1且x≠1; (D)x≥-1. 3 一无二次方程1/2x~2-4x+6=0的根的情况是
1. Multiple-choice questions: 1 Let a≠0 be the correct one in the following operations: (A)a~2·a~3=a~6; (B)(a~3)~2=a~9; (C )(a-1)~0=1; (D)a~2÷a~3=1/a 2 Function y=(x+1)~(1/2)/(x-1), independent variable The range of x is (A)x≥0; (B)x≠1; (C)x≥-1 and x≠1; (D)x≥-1. 3 There is no quadratic equation 1/2x~ The root of 2-4x+6=0 is