1.平面A与长方体的12条棱所成的角都等于B,则sinB=?2.设正数x,y满足log2(x+y+3)=log2x+log2y,则x+y的取值范围是?答案是【6,+无穷)3.如果函数y=logax的图像过P(2,-2)lim(a+a^2+a^3+……+a^n),n趋于正无穷的值是?
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![1.平面A与长方体的12条棱所成的角都等于B,则sinB=?2.设正数x,y满足log2(x+y+3)=log2x+log2y,则x+y的取值范围是?答案是【6,+无穷)3.如果函数y=logax的图像过P(2,-2)lim(a+a^2+a^3+……+a^n),n趋于正无穷的值是?](/uploads/image/z/11720044-28-4.jpg?t=1.%E5%B9%B3%E9%9D%A2A%E4%B8%8E%E9%95%BF%E6%96%B9%E4%BD%93%E7%9A%8412%E6%9D%A1%E6%A3%B1%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E9%83%BD%E7%AD%89%E4%BA%8EB%2C%E5%88%99sinB%3D%3F2.%E8%AE%BE%E6%AD%A3%E6%95%B0x%2Cy%E6%BB%A1%E8%B6%B3log2%28x%2By%2B3%29%3Dlog2x%2Blog2y%2C%E5%88%99x%2By%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%3F%E7%AD%94%E6%A1%88%E6%98%AF%E3%80%906%2C%2B%E6%97%A0%E7%A9%B7%EF%BC%893.%E5%A6%82%E6%9E%9C%E5%87%BD%E6%95%B0y%3Dlogax%E7%9A%84%E5%9B%BE%E5%83%8F%E8%BF%87P%282%2C-2%29lim%28a%2Ba%5E2%2Ba%5E3%2B%E2%80%A6%E2%80%A6%2Ba%5En%29%2Cn%E8%B6%8B%E4%BA%8E%E6%AD%A3%E6%97%A0%E7%A9%B7%E7%9A%84%E5%80%BC%E6%98%AF%3F)
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