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(1)(2a-3·b-)·(-3a-1b)÷(4a-4b-)
(2)log535-2log5+log57-log51.8
若2a>b>0,则a+的最小值为
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(1)若S={2,3,4},A={4,3},则SA=________;
(2)若S={三角形},B={锐角三角形},则SB=________;
(3)若S={1,2,4,8},A=,则SA=________;
(4)若U={1,3,a2+2a+1},A={1,3},UA={5},则a=________;
(5)已知A={0,2,4},UA={-1,1},UB=(-1,0,2),则B=________.