合并同类项:2x2+1-3x+7-3x2+5x.
问题描述:
合并同类项:2x2+1-3x+7-3x2+5x.
答
2x2+1-3x+7-3x2+5x
=(2-3)x2+(-3+5)x+8,
=-x2+2x+8.