高一数学,求详解
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3^x=6
lg3^x=xlg3=lg6=lg2*3=lg2+lg3
x=lg2/lg3+1
4^y=2^2y=6
lg2^2y=2ylg2=lg6=lg2*3=lg2+lg3
2y=lg3/lg2+1 -->y=(lg3/lg2+1)/2
x+2y=lg2/lg3+1+lg3/lg2+1
=lg2/lg3+lg3/lg2+2
xy=(lg2/lg3+1)(lg3/lg2+1)/2
=1/2(1+lg2/lg3+lg3/lg2+1)
=1/2(lg3/lg2+lg2/lg3+2)
2/x+1/y
=(2y+x)/xy
=(lg2/lg3+lg3/lg2+2) / 1/2(lg3/lg2+lg2/lg3+2)
=1/1/2
=2
lg3^x=xlg3=lg6=lg2*3=lg2+lg3
x=lg2/lg3+1
4^y=2^2y=6
lg2^2y=2ylg2=lg6=lg2*3=lg2+lg3
2y=lg3/lg2+1 -->y=(lg3/lg2+1)/2
x+2y=lg2/lg3+1+lg3/lg2+1
=lg2/lg3+lg3/lg2+2
xy=(lg2/lg3+1)(lg3/lg2+1)/2
=1/2(1+lg2/lg3+lg3/lg2+1)
=1/2(lg3/lg2+lg2/lg3+2)
2/x+1/y
=(2y+x)/xy
=(lg2/lg3+lg3/lg2+2) / 1/2(lg3/lg2+lg2/lg3+2)
=1/1/2
=2
更多追问追答
追问
额。。上面一题呢?
追答
看不清,貌似是小米吧!呵呵
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