已知=4,x=a+3,y=b+3,求证为定值.——青夏教育精英家教网——

已知=4,x=a+3,y=b+3,求证为定值.

已知=3,求的值.

若10^x=3,10^y=4,则10^x-y=_________________.

设a=,b=,c=,则a、b、c的大小关系是________________.

式子的化简结果为( )

A.1 B.10 C.100 D.

化简(-3)()÷()得( )

A.6a B.-a C.-9a D.9a

计算下列各式:

(1)×(-)⁰+8^0.25×+(×)⁶-;

(2)÷(1-2)×.

已知2^x-2^-x=3,则4^x+4^-x=__________________.

=___________________.

计算7+3-7-5的结果是( )

A.0 B.54 C.-6 D.40

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