问题
解答题
计算:(4x2-2x3+6x)÷(-2x)-(2x-1)2.
答案
原式=-2x+x2-3-(2x-1)2
=-2x+x2-3-(4x2-4x+1)
=-2x+x2-3-4x2+4x-1
=x2-4x2-2x+4x-3-1
=-3x2+2x-4.
计算:(4x2-2x3+6x)÷(-2x)-(2x-1)2.
原式=-2x+x2-3-(2x-1)2
=-2x+x2-3-(4x2-4x+1)
=-2x+x2-3-4x2+4x-1
=x2-4x2-2x+4x-3-1
=-3x2+2x-4.