2x+5y-3z=4应是2x+5y+3z=4吧,
4^x*32^y^8^z-(1/2)^-4
=2^(2x+5y+3z)-16
=2^4-16=0
已知2x+5y-3z=4,求4^x*32^y^8^z-(1/2)^-4
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