如果log2［log3(log4x)］=log3［log4(log2y)］=log4［log2(log3z)］=0,则x+y-z等于A.70 B.71 C.89 ——青夏教育精英家教网——

如果log₂［log₃(log₄x)］=log₃［log₄(log₂y)］=log₄［log₂(log₃z)］=0,则x+y-z等于( )

A.70 B.71 C.89 D.90

定义运算法则如下:a*b=,ab=lga²-lg,M=2*,N=,则M+N=_________________.

(1)log₂+log₂12-log₂42;

(2)lg2·lg50-lg5·lg20-lg4.

已知a^m=2,aⁿ=3,求a^3m-2n的值.

已知a、b、c为△ABC的三边,且关于x的方程x²-2x+lg(c²-b²)-2lga+1=0有等根,判断△ABC的形状.

已知f(x)= 则f{f［f(-2-3)］}=______________.

若lgx=a,lgy=b,则lg-lg()²的值为( )

A.a-2b-2 B.a-2b+2

C.a-2b-1 D.a-2b+1

设=n,那么n的值属于下列哪一个区间?( )

A.(2,3) B.(1,2) C.(-2,-1) D.(-3,-2)

已知log₃2=a,3^b=5,试用a、b表示log₃.

已知下面四个等式:(1)lg(ab)=lga+lgb;(2)lg=lga-lgb;(3)lg()²=lg;(4)lg(ab)=.

其中正确的命题的个数为_________________.

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