(2014*济[旳二模)log2silTY^+log2COS—的值为(B-1C22.(2014・成都一模)计算log5V5+4B5・~21㊁所得的结果为(c7.~2)D43.若a>2,b>2,JiL—log?(a+b)-hog。—+log2—则logo(a-2)+log9(b・2)=()2a2a+b“2高中数学指数、对数的运算一.选择题(共28小题))D1A0B丄C1D2124.(2014*泸州二模)式子log?(log216)+83x4宀()10A4•B6•C•8D•5.(2014*泸州一模)21Q嗨的值为()A1•B2•C•3D•46.(2015・成都模拟)计算21og63+log64的结果是()Alog62■B2■C■呃3D•37.(2014*浙江模拟)log212-log23=()A2B0C1D-2■■■~2■8.(2014*浙江模拟)下列算式正确的是()Alg8+lg2=lglO■BIg8+lg2=lg6■C■Ig8+lg2=lgl6D■Ig8+lg2=lg49.(2014*和平区二模)已知3x=5y=a,且丄+丄=2,则a的值为()XyA届B15C±V15D225flog9x(x>0)110.(20l3・枣庄二模)已知函数f(x)斗,则f[f(2)]的值是()3X(x东莞一模)已知函数f(x)=0)2X(x