(1)|2﹣tan60°|﹣(π﹣3.14) 0 +(﹣ ) ﹣2 + ;

1个回答

  • (1)|2﹣tan60 °|﹣

    =|2﹣

    |﹣1+4+

    ×2

    =2﹣

    ﹣1+4+

    =5;

    (2)(

    )÷

    =[

    ]

    =

    =

    =

    当a=

    ﹣1时,原式=

    =

    (3)3﹣

    =

    ,去分母得:3(6x﹣2)﹣2=4,18x﹣6﹣2=4,

    解得:x=

    经检验,x=

    是原分式方程的解;

    (4)

    由不等式①,解得:x≤3,

    由不等式②,去分母得:3x﹣3﹣4x+2>6,

    解得:x<﹣7,在数轴上表示为下图:

    则原不等式组解集是x<﹣7.