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

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

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