1.设3^a=4^b=36,则2/a+1/b=?

设3a=4b=36，则2a+1b 设a，b∈R+，a+2b=3，则1a+1b 设集合A{1,2,3,4},B{3,4,5},则A∩B= ,A∪B= 设3^a=4^b=36.则2/a+1/b=多少? 设A=4a的平方+5b,B=-3a的平方+2b,求A-3B,其中a=-1,b=2. 设向量a,b满足|a|=1,|b|=根号2,|3a+b|=4,则|3a-2b|=________ 设a^3+b^3=2 求证a+b 设a^3+b^3=2,求证：a+b 设向量a.b满足|a |=|b |=1,|3a-2b |=3,求|3a+b| 设a>b>0,证明a^2+1/ab+1/a(a-b)>=4 设a,b∈R,集合｛1,a+b,a｝=｛0,b/a,b｝,则b-a=? 设A,B为三阶矩阵,| A| =3,| B| =-2 ,则| -2 A*T B*-1 |