负二分之一的负一次方减二加1减负二的负三次方等于__.
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负二分之一的负一次方减二加1减负二的负三次方等于__.
若81的2+m次方=27的x+5次方,则x=__,
当3m+2n=6时,则8的m次方乘以4的n次方等于__.
化简:2的n+4次方减2乘以2的n次方的差,除以2乘以2的n+3次方的商的结果是__.
我承认这是家庭作业,但确实是做不出来,
若81的2+m次方=27的x+5次方,则x=__,
当3m+2n=6时,则8的m次方乘以4的n次方等于__.
化简:2的n+4次方减2乘以2的n次方的差,除以2乘以2的n+3次方的商的结果是__.
我承认这是家庭作业,但确实是做不出来,
![负二分之一的负一次方减二加1减负二的负三次方等于__.](/uploads/image/z/1481356-28-6.jpg?t=%E8%B4%9F%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%E7%9A%84%E8%B4%9F%E4%B8%80%E6%AC%A1%E6%96%B9%E5%87%8F%E4%BA%8C%E5%8A%A01%E5%87%8F%E8%B4%9F%E4%BA%8C%E7%9A%84%E8%B4%9F%E4%B8%89%E6%AC%A1%E6%96%B9%E7%AD%89%E4%BA%8E%EF%BC%BF%EF%BC%BF%EF%BC%8E)
(-1/2)^(-1)-2+1-(-2)^(-3)
=-2-2+1+1/8
=-23/8
81^(2+m)=27^(x+5)
3^[4(2+m)]=3^[3(x+5)]
4(2+m)=3(x+5)
8+4m=3x+15
x=(4m-7)/3
8^m*4^n
=2^3m*2^2n
=2^(3m+2n)
=2^6
=64
[2^(n+4)-2*2^n]÷[2*2^(n+3)]
=[16*2^n-2*2^n]÷[2*2^3*2^n]
=(14*2^n)÷(16*2^n)
=7/8
=-2-2+1+1/8
=-23/8
81^(2+m)=27^(x+5)
3^[4(2+m)]=3^[3(x+5)]
4(2+m)=3(x+5)
8+4m=3x+15
x=(4m-7)/3
8^m*4^n
=2^3m*2^2n
=2^(3m+2n)
=2^6
=64
[2^(n+4)-2*2^n]÷[2*2^(n+3)]
=[16*2^n-2*2^n]÷[2*2^3*2^n]
=(14*2^n)÷(16*2^n)
=7/8