先化简(2x-1)²-(3x+1)(3x-1)+20x³(x-1)÷(-2x)²_数学解答

先化简(2x-1)²-(3x+1)(3x-1)+20x³(x-1)÷(-2x)²

人气：491 ℃　时间：2020-05-21 18:32:14

解答

(2x-1)²-(3x+1)(3x-1)+20x³(x-1)÷(-2x)²=(2x-1)²-(9x²-1)+5x(x-1)
=4x²-4x+1-9x²+1+5x²-5x
=-9x+1