14(1)(a+b)^2-(a-b)^2+( )(2)若a+b=5,a-b=3,则ab的值为( )(1)(a+b)^2-(a-b)^2+( )(2)若a+b=5,a-b=3,则ab的值为( )
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![14(1)(a+b)^2-(a-b)^2+( )(2)若a+b=5,a-b=3,则ab的值为( )(1)(a+b)^2-(a-b)^2+( )(2)若a+b=5,a-b=3,则ab的值为( )](/uploads/image/z/2583794-2-4.jpg?t=14%281%29%28a%2Bb%29%5E2-%28a-b%29%5E2%2B%28+%29%282%29%E8%8B%A5a%2Bb%3D5%2Ca-b%3D3%2C%E5%88%99ab%E7%9A%84%E5%80%BC%E4%B8%BA%28+%29%281%29%28a%2Bb%29%5E2-%28a-b%29%5E2%2B%28+%29%282%29%E8%8B%A5a%2Bb%3D5%2Ca-b%3D3%2C%E5%88%99ab%E7%9A%84%E5%80%BC%E4%B8%BA%28+%29)
14(1)(a+b)^2-(a-b)^2+( )(2)若a+b=5,a-b=3,则ab的值为( )(1)(a+b)^2-(a-b)^2+( )(2)若a+b=5,a-b=3,则ab的值为( )
14(1)(a+b)^2-(a-b)^2+( )(2)若a+b=5,a-b=3,则ab的值为( )
(1)(a+b)^2-(a-b)^2+( )
(2)若a+b=5,a-b=3,则ab的值为( )
14(1)(a+b)^2-(a-b)^2+( )(2)若a+b=5,a-b=3,则ab的值为( )(1)(a+b)^2-(a-b)^2+( )(2)若a+b=5,a-b=3,则ab的值为( )
(1)(a+b)^2-(a-b)^2+( ) 目的是什么?(2)若a+b=5,a-b=3,则ab的值为( 4) 由a+b=5,得a^2+b^2+2ab=25 由a-b=3,得a^2+b^2-2ab=9 两式相减得4ab=16 所以ab=4