1、已知an=8,amn=64,求m的值?2、若am=3,an=5,(1)am-n = ,(2) a3m-2n= 3、(1)若 2x =1/32,则x=还有(2)若(-2)x = (-2)3÷(-2)2x 则x=(3)若0.000 000 3=3×103,则x= (4)若(3/2)x=1/9,则x=
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1、已知an=8,amn=64,求m的值?2、若am=3,an=5,(1)am-n = ,(2) a3m-2n= 3、(1)若 2x =1/32,则x=还有(2)若(-2)x = (-2)3÷(-2)2x 则x=(3)若0.000 000 3=3×103,则x= (4)若(3/2)x=1/9,则x=
1、已知an=8,amn=64,求m的值?2、若am=3,an=5,(1)am-n = ,(2) a3m-2n= 3、(1)若 2x =1/32,则x=
还有(2)若(-2)x = (-2)3÷(-2)2x 则x=
(3)若0.000 000 3=3×103,则x=
(4)若(3/2)x=1/9,则x=
1、已知an=8,amn=64,求m的值?2、若am=3,an=5,(1)am-n = ,(2) a3m-2n= 3、(1)若 2x =1/32,则x=还有(2)若(-2)x = (-2)3÷(-2)2x 则x=(3)若0.000 000 3=3×103,则x= (4)若(3/2)x=1/9,则x=
a^n=8
a^mn=64
(a^n)^m=8^2
8^m=8^2
m=2
a^m=3,a^n=5
a^(m-n)
=a^m÷a^n
=5/3
a^(3m-2n)
=(a^3m)÷a^2n
=(a^m)^3÷(a^n)^2
=3^3÷5^2
=27/25
2^x=1/32
2^x=(1/2)^5
2^x=2^(-5)
x=-5
(2)若(-2)^x = (-2)^3÷(-2)^2x 则x=
(-2)^x = (-2)^(3-2x)
x=3-2x
3x=3
x=1
(3)若0.000 000 3*10^x=3×10^3,则x=
0.000 000 3*10^x=3×10^3
3×10^(-7)*10^x=3×10^3
3×10^(x-7)=3×10^3
10^(x-7)=10^3
x-7=3
x=10