题目内容
化简:
(1)9a+7a-6a
(2)(3a2-b2)-3(a2-2b2)
(1)9a+7a-6a
(2)(3a2-b2)-3(a2-2b2)
(1)9a+7a-6a
=16a-6a
=10a;
(2)(3a2-b2)-3(a2-2b2)
=3a2-b2-3a2+6b2
=5b2.
=16a-6a
=10a;
(2)(3a2-b2)-3(a2-2b2)
=3a2-b2-3a2+6b2
=5b2.
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