(1)计算: π0+2cos30°−|2−√3|−(12)−2;
(2)化简: (2−x−1x+1)÷x2+6x+9x2−1.
计算 (1+1x)÷x2+2x+1x的结果是 ( )
A. x+1B. 1x+1C. xx+1D. x+1x
下列各式变形中,正确的是 ( )
A. x2⋅x3=x6B. √x2=|x|
C. (x2−1x)÷x=x−1D. x2−x+1=(x−12)2+14
(1)计算: sin30°+(2018−√3)0−2−1+|−4|;
(2)化简: (1−2x−1)÷x−3x2−1.
(1)计算 (2017−π)0−(14)−1+|−2|
(2)化简 (1−1a−1)÷(a2−4a+4a2−a).
试题篮
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