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