计算：(x+2x-x-1x-2)÷x-4x．

题型：解答题难度：一般来源：徐汇区二模

计算：(

x+2

x

-

x-1

x-2

)÷

x-4

x

．

答案

(

x+2

x

-

x-1

x-2

)÷

x-4

x

=

(x+2)(x-2)-x(x-1)

x(x-2)

×

x

x-4

=

1

x-2

．