2^x-1=a ,2^y-1=b.则2^x+y= 是2^(x-1)=a.2^(y-1)=b.则2^(x+y)=

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2^x-1=a,2^y-1=b.则2^x+y=是2^(x-1)=a.2^(y-1)=b.则2^(x+y)=2^x-1=a,2^y-1=b.则2^x+y=是2^(x-1)=a.2^(y-1)=b.则2^

2^x-1=a ,2^y-1=b.则2^x+y= 是2^(x-1)=a.2^(y-1)=b.则2^(x+y)=
2^x-1=a ,2^y-1=b.则2^x+y=
是2^(x-1)=a.2^(y-1)=b.则2^(x+y)=

2^x-1=a ,2^y-1=b.则2^x+y= 是2^(x-1)=a.2^(y-1)=b.则2^(x+y)=
2^(x+y)=2^x*2^y=2^(x-1)*2^(y-1)*2*2=4ab

2^x=1+a,2^y=1+b
2^(x+y)=(2^x)*(2^y)=(1+a)(1+b)

2^x-1=a得2^x=a+1,2^y-1=b得2^y=b+1
2^x+y=2^x*2^y=(a+1)*(b+1)

y=log2(b+1)
2^x=a+1
2^x+y=a+1+log2(b+1)