如图所示,在梯形ABCD中,AD//BC,AC⊥AB,AD=CD,cosB=5/13,BC=26.【1】 cos∠DAC的值?【2】线段AD的长?
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![如图所示,在梯形ABCD中,AD//BC,AC⊥AB,AD=CD,cosB=5/13,BC=26.【1】 cos∠DAC的值?【2】线段AD的长?](/uploads/image/z/8601512-32-2.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%2F%2FBC%2CAC%E2%8A%A5AB%2CAD%3DCD%2CcosB%3D5%2F13%2CBC%3D26.%E3%80%901%E3%80%91+cos%E2%88%A0DAC%E7%9A%84%E5%80%BC%3F%E3%80%902%E3%80%91%E7%BA%BF%E6%AE%B5AD%E7%9A%84%E9%95%BF%3F)
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