化简 3a-{2c-【6a-(c-b)+c+(a+8b-9c)】} (3a的平方-ab+1)-(4a的平方+6ab+7)3a-{2c-【6a-(c-b)+c+(a+8b-9c)】}(3a的平方-ab+1)-(4a的平方+6ab+7)

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化简 3a-{2c-【6a-(c-b)+c+(a+8b-9c)】} (3a的平方-ab+1)-(4a的平方+6ab+7)3a-{2c-【6a-(c-b)+c+(a+8b-9c)】}(3a的平方-ab+1)-(4a的平方+6ab+7)
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化简 3a-{2c-【6a-(c-b)+c+(a+8b-9c)】} (3a的平方-ab+1)-(4a的平方+6ab+7)3a-{2c-【6a-(c-b)+c+(a+8b-9c)】}(3a的平方-ab+1)-(4a的平方+6ab+7)
化简 3a-{2c-【6a-(c-b)+c+(a+8b-9c)】} (3a的平方-ab+1)-(4a的平方+6ab+7)
3a-{2c-【6a-(c-b)+c+(a+8b-9c)】}
(3a的平方-ab+1)-(4a的平方+6ab+7)

化简 3a-{2c-【6a-(c-b)+c+(a+8b-9c)】} (3a的平方-ab+1)-(4a的平方+6ab+7)3a-{2c-【6a-(c-b)+c+(a+8b-9c)】}(3a的平方-ab+1)-(4a的平方+6ab+7)
3a-{2c-【6a-(c-b)+c+(a+8b-9c)】}
=3a-2c+6a-c-b-c-a-8b+9c
=8a-9b+5c
(3a的平方-ab+1)-(4a的平方+6ab+7)
=3a²-ab+1-4a²-6ab-7
=-a²-7ab-6

3a-{2c-【6a-(c-b)+c+(a+8b-9c)】}
=3a-[2c-(6a-c+b+c+a+8b-9c)]
=3a-(2c-6a+c-b-c-a-8b+9c)
=3a-2c+6a-c+b+c+a+8b-9c
=10a-11c+9b
(3a²-ab+1)-(4a²+6ab+7)
=3a²-ab+1-4a²-6ab-7
=-a²-7ab-6