2∧x=3 log[4∧(8/3)]=y 则x+2y=
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2∧x=3 log[4∧(8/3)]=y 则x+2y=
x=log2(3)
y=lg(8/3)/lg4
=lg(8/3)/2lg2
=1/2*log2(8/3)
所以x+2y=log2(3)+log2(8/3)
=log2(3×8/3)
=log2(8)
=log2(2³)
=3 再答: 有可能手机看不到指数,又来了一遍 x=log2(3) y=lg(8/3)/lg4 =lg(8/3)/2lg2 =1/2*log2(8/3) 所以x+2y=log2(3)+log2(8/3) =log2(3×8/3) =log2(8) =log2(2^3) =3
再问:
再答: 2.log3(5)=q log8(3)=log2^3(3)=1/3log3(2)=p log3(2)=3p lg5=log3(5)/log3(10)=log3(5)/[log3(5)+log3(2)]=q/(q+3p)
再答: 3.log3[log4(log5a)]=log4[log3(log5b)]=0 那么,对于log3[log4(log5a)]=0 有 log4(log5a)=1 因此 log5a=4 a=5^4 对于 log4[log3(log5b)]=0 有 log3(log5b)=1 因此 log5b=3 b=5^3 于是 a/b=5^4/5^3=5
再答: 4.原式=(3^2)^[log9(lg2-1)]+(5^2)^[log25(lg0.5-2)] =9^[log9(lg2-1)]+25^[log25(lg0.5-2)] =(lg2-1)+(lg0.5-2) =lg(2×0.5)-3 =0-3 =-3
再答: 5.
再答: 6.log2(3)=a ---->log3(2)=1/a log3(7)=b log12(56)=log3(56)/log3(12) =log3(7*2³)/log3(3*2²) =【log3(7)+3log3 (2)】/[log3(3)+2log3(2)] =(b+3/a)/(1+2/a) =(ab+3)/(a+2)
再问: 嗯
再答: 还没完,马上继续
再答: 7.令t=10^x 则x=lgt f(t)=lgt 所以f(3)=lg3
再答: 8.log5(35)-log5(1/50)-log5(14)+2log1/2( 根号2) =log5(35/(1/50))-log5(14)+2log2( 根号2) =log5(35*50))-log5(14)+2log1/2(1/2的负二分之一次方) =log5(35*50/14)+2*(-1/2) =3-1 =2
再答: 9.(lg2)^3+(lg5)^+3lg2lg5 =(lg2+lg5)^3-3(lg2)^2lg5-3lg2(lg5)^2+3lg2lg5 =(lg(2*5))^3-3lg2lg5(lg2+lg5-1) =1^3-3lg2lg5(lg10-1) =1
再答: 全部好了
再问: 非常感谢
再答: 那就采纳吧,谢谢,祝学习快乐!
再问: 嗯
y=lg(8/3)/lg4
=lg(8/3)/2lg2
=1/2*log2(8/3)
所以x+2y=log2(3)+log2(8/3)
=log2(3×8/3)
=log2(8)
=log2(2³)
=3 再答: 有可能手机看不到指数,又来了一遍 x=log2(3) y=lg(8/3)/lg4 =lg(8/3)/2lg2 =1/2*log2(8/3) 所以x+2y=log2(3)+log2(8/3) =log2(3×8/3) =log2(8) =log2(2^3) =3
再问:
再答: 2.log3(5)=q log8(3)=log2^3(3)=1/3log3(2)=p log3(2)=3p lg5=log3(5)/log3(10)=log3(5)/[log3(5)+log3(2)]=q/(q+3p)
再答: 3.log3[log4(log5a)]=log4[log3(log5b)]=0 那么,对于log3[log4(log5a)]=0 有 log4(log5a)=1 因此 log5a=4 a=5^4 对于 log4[log3(log5b)]=0 有 log3(log5b)=1 因此 log5b=3 b=5^3 于是 a/b=5^4/5^3=5
再答: 4.原式=(3^2)^[log9(lg2-1)]+(5^2)^[log25(lg0.5-2)] =9^[log9(lg2-1)]+25^[log25(lg0.5-2)] =(lg2-1)+(lg0.5-2) =lg(2×0.5)-3 =0-3 =-3
再答: 5.
再答: 6.log2(3)=a ---->log3(2)=1/a log3(7)=b log12(56)=log3(56)/log3(12) =log3(7*2³)/log3(3*2²) =【log3(7)+3log3 (2)】/[log3(3)+2log3(2)] =(b+3/a)/(1+2/a) =(ab+3)/(a+2)
再问: 嗯
再答: 还没完,马上继续
再答: 7.令t=10^x 则x=lgt f(t)=lgt 所以f(3)=lg3
再答: 8.log5(35)-log5(1/50)-log5(14)+2log1/2( 根号2) =log5(35/(1/50))-log5(14)+2log2( 根号2) =log5(35*50))-log5(14)+2log1/2(1/2的负二分之一次方) =log5(35*50/14)+2*(-1/2) =3-1 =2
再答: 9.(lg2)^3+(lg5)^+3lg2lg5 =(lg2+lg5)^3-3(lg2)^2lg5-3lg2(lg5)^2+3lg2lg5 =(lg(2*5))^3-3lg2lg5(lg2+lg5-1) =1^3-3lg2lg5(lg10-1) =1
再答: 全部好了
再问: 非常感谢
再答: 那就采纳吧,谢谢,祝学习快乐!
再问: 嗯
2∧x=3 log[4∧(8/3)]=y 则x+2y=
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