问题
解答题
化简求值:(
|
答案
原式=(
-x+2 x-2
)÷x-2 x+2 x x-2
=
×8x x2-4 x-2 x
=
,8 x-2
∵x=sin30°+cos245°=
+1 2
=1,1 2
∴原式=
=8 x-2
=8 1+2
.8 3
化简求值:(
|
原式=(
-x+2 x-2
)÷x-2 x+2 x x-2
=
×8x x2-4 x-2 x
=
,8 x-2
∵x=sin30°+cos245°=
+1 2
=1,1 2
∴原式=
=8 x-2
=8 1+2
.8 3