(3a²-ab+7)-(-4a²+2ab+7).等于几?

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(3a²-ab+7)-(-4a²+2ab+7).等于几?
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(3a²-ab+7)-(-4a²+2ab+7).等于几?
(3a²-ab+7)-(-4a²+2ab+7).等于几?

(3a²-ab+7)-(-4a²+2ab+7).等于几?