问题
解答题
先化简,再求值:(
|
答案
x=2(cot45°-cos30°)=2(1-
)=2-3 2
.3
∴原式=[
-1 x(x-2)
]÷1 (x-2)2 2 x(x-2)
=
•-2 x(x-2)2 x(x-2) 2
=-1 (x-2)
=-
=1 2-
-23
=1 3
.3 3
先化简,再求值:(
|
x=2(cot45°-cos30°)=2(1-
)=2-3 2
.3
∴原式=[
-1 x(x-2)
]÷1 (x-2)2 2 x(x-2)
=
•-2 x(x-2)2 x(x-2) 2
=-1 (x-2)
=-
=1 2-
-23
=1 3
.3 3