(-t³+3t²-5t+7)+(5t²-7t)-(t³-t+3) 帮我看看.最好写过程.

来源：学生作业学帮网编辑：学帮网时间：2024/06/06 11:44:37

(-t³+3t²-5t+7)+(5t²-7t)-(t³-t+3)
=-t³+3t²-5t+7+5t²-7t-t³+t-3
=-2t³+8t²-11t+4