数学,指数对数函数,求过程?
3个回答
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(4)
(1/2)lg4 +2lg√5
=lg2 +lg5
=lg10
=1
log<5>100 +log<5>0.25
=log<5>25
=2log<5>5
=2
(5)
f(3x)=log<2>√[(9x+5)/2]
x=1/3
f(1) =log<2>√[(3+5)/2] =log<2>2 =1
x=-1/3
f(-1) =log<2>√[(-3+5)/2] =log<2>1 =0
(6)
|2x-1|+(y-2)^2=0
2x-1=0 and y-2=0
x=1/2 and y=2
log<x>y
=log<1/2> 2
=-log<1/2> (1/2)
=-1
(1/2)lg4 +2lg√5
=lg2 +lg5
=lg10
=1
log<5>100 +log<5>0.25
=log<5>25
=2log<5>5
=2
(5)
f(3x)=log<2>√[(9x+5)/2]
x=1/3
f(1) =log<2>√[(3+5)/2] =log<2>2 =1
x=-1/3
f(-1) =log<2>√[(-3+5)/2] =log<2>1 =0
(6)
|2x-1|+(y-2)^2=0
2x-1=0 and y-2=0
x=1/2 and y=2
log<x>y
=log<1/2> 2
=-log<1/2> (1/2)
=-1
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