{( )-6b+13}+{9b²-( )+17}=2b2+3b+( )急{( )-6b+13}-{9b²-( )+17}=2b²+3b+( )
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![{( )-6b+13}+{9b²-( )+17}=2b2+3b+( )急{( )-6b+13}-{9b²-( )+17}=2b²+3b+( )](/uploads/image/z/7619439-39-9.jpg?t=%EF%BD%9B%EF%BC%88+%EF%BC%89-6b%2B13%EF%BD%9D%2B%EF%BD%9B9b%26%23178%3B-%28+%29%2B17%EF%BD%9D%3D2b2%2B3b%2B%28+%29%E6%80%A5%EF%BD%9B%EF%BC%88+%EF%BC%89-6b%2B13%EF%BD%9D-%EF%BD%9B9b%26%23178%3B-%28+%29%2B17%EF%BD%9D%3D2b%26%23178%3B%2B3b%2B%28+%29)
{( )-6b+13}+{9b²-( )+17}=2b2+3b+( )急{( )-6b+13}-{9b²-( )+17}=2b²+3b+( )
{( )-6b+13}+{9b²-( )+17}=2b2+3b+( )
急
{( )-6b+13}-{9b²-( )+17}=2b²+3b+( )
{( )-6b+13}+{9b²-( )+17}=2b2+3b+( )急{( )-6b+13}-{9b²-( )+17}=2b²+3b+( )
{(-7b² )-6b+13}+{9b²-(-9b )+17}=2b²+3b+( 30)
{(11b² )-6b+13}-{9b²-( 9b)+17}=2b²+3b+( -4)
不知道你中间到底是+还是- 都给你做了!
{(-7b²)-6b+13}+{9b²-(-9b)+17}=2b²+3b+(30)