1.已知复数z满足z=1:+1,则|z|=1+iA.3B.√13C.4D.52.已知集合A={x|n(x-2)≤0},B={x|x2-9x-5<0},则(aB=A.(-5,0]U(,3]B.(-,2C.(-,2]U(3,5)D.(3,5)3.函数f(x)=1++的图象在点(,f()处的切线斜率为A.2B.-2C.4D.-4