(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.
(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.