(-t³+3t²-5t+7)+(5t²-7t)-(t³-t+3) 帮我看看.最好写过程.
问题描述：
(-t³+3t²-5t+7)+(5t²-7t)-(t³-t+3) 帮我看看.最好写过程.
答
(-t³+3t²-5t+7)+(5t²-7t)-(t³-t+3)
=-t³+3t²-5t+7+5t²-7t-t³+t-3
=-2t³+8t²-11t+4