(1)若a-b=1时,则代数式3a²-3ab-3a+13的值是?(2)在钟表上,9点24分时,分针与时针的夹角是________度.
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![(1)若a-b=1时,则代数式3a²-3ab-3a+13的值是?(2)在钟表上,9点24分时,分针与时针的夹角是________度.](/uploads/image/z/1241764-52-4.jpg?t=%EF%BC%881%EF%BC%89%E8%8B%A5a-b%3D1%E6%97%B6%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8F3a%26sup2%3B-3ab-3a%2B13%E7%9A%84%E5%80%BC%E6%98%AF%3F%EF%BC%882%EF%BC%89%E5%9C%A8%E9%92%9F%E8%A1%A8%E4%B8%8A%2C9%E7%82%B924%E5%88%86%E6%97%B6%2C%E5%88%86%E9%92%88%E4%B8%8E%E6%97%B6%E9%92%88%E7%9A%84%E5%A4%B9%E8%A7%92%E6%98%AF________%E5%BA%A6.)
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(1)若a-b=1时,则代数式3a²-3ab-3a+13的值是?(2)在钟表上,9点24分时,分针与时针的夹角是________度.
(1)若a-b=1时,则代数式3a²-3ab-3a+13的值是?
(2)在钟表上,9点24分时,分针与时针的夹角是________度.
(1)若a-b=1时,则代数式3a²-3ab-3a+13的值是?(2)在钟表上,9点24分时,分针与时针的夹角是________度.
a-b=1时
3a²-3ab-3a+13=3a(a-b)-3a+13=3a-3a+13=13在钟表上,9点24分时,分针与时针的夹角是138°