質問: if `3^x=5^y=45^z ,` then a. `2/z=1/y-1/x` b. `2/y=1/x-1/z` c. `2/x=1/z-1/y` d. `x+y+z=0` if `3^x=5^y=45^z ,` then a. `2/z=1/y-1/x` b. `2/y=1/x-1/z` c. `2/x=1/z-1/y` d. `x+y+z=0`
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