题目内容：

(x的四次方+2x的三次方-二分之一x的二次方)÷(二分之一x的平方) 怎么算?

优质解答

（x^4 + 2x^3 - (1/2)x^2 )÷(1/2)x^2
=x^4÷(1/2)x^2 + 2x^3 ÷ (1/2)x^2 - (1/2)x^2÷(1/2)x^2
=2x^2 + 4x - 1