(-x+2x²+5)+(4x²-3-6x)怎么算?
问题描述:
(-x+2x²+5)+(4x²-3-6x)怎么算?
(-x+2x²+5)+(4x²-3-6x)这道题怎么算?
还有就是符号怎么确定?老师讲得太快没听清.
答
(-x+2x²+5)+(4x²-3-6x)
=-x+2x²+5+4x²-3-6x
=6x²-7x+2