schoology+log+in
@房包2404：schoology登陆不上怎么办 -
项彭18365161661…… 1、换个浏览器试试,比如谷歌浏览器 火狐狸浏览器; 2、先卸载系统原来的flash player,再去官网下载安装; 3、还不行,直接使用Mac版优酷客户端,在客户端上面看优酷视频.
@房包2404：log62+(log62)(log63)+(log63)2= - ----- -
项彭18365161661…… log62+(log62)(log63)+(log63)2=log62+(log62+log63)log63=log62+log63=1 故答案为:1
@房包2404：7^log<7>2=? -
项彭18365161661…… 答:7^ [log7(2)]=2 设7^[log7(2)]=x 两边取7的对数:log7 { 7^[log7(2)] } = log7(x) [ log7(2) ]*log7(7)=log7(x) log7(2)=log7(x) x=2
@房包2404：计算:2log5 10+log5 0.25= - ----- -
项彭18365161661…… 2log5 10+log5 0.25=log5 10^2+log5 0.25=log5 (100*0.25) =log5 25=2
@房包2404：已知函数f(x)=3的x次方,x2,则f(2+log32)=f(x)=3的x次方,x2, - 作业帮
项彭18365161661…… [答案] 2+log3(2)>2 ∴f(2+log3(2)) =f(2+log3(2) -2) =f(log3(2)) log3(2)
@房包2404：(log4 3+log8 3)(log3 5+log9 5)(log5 2+log25 2)= -
项彭18365161661…… (log2 3/log2 4+log2 3/log2 8)(log3 5/log3 3+log3 5/log3 9)(log5 2/log5 5+log5 2/log5 25)=[(5log2 3)/6][(3log3 5)/2][(3log5 2)/2] 然后全部换成以2为底的对数得上式=(5/6)(3/2)(3/2)[(log2 3/log2 2)(log2 5/log2 3)(log2 2/log2 5)]=15/8
@房包2404：25^(1/3log5^27+log5^2)= -
项彭18365161661…… 25^(1/3log5^27+log5^2)=(5^2)^[log5^(27^1/3)+log5^2]=(5^2)^[log5^3+log5^2]=(5^2)^(log5^6)=5^2log5^6=5^log5^(6^2)=36
@房包2404：设α,β是方程(lgx)^2 - lgx^2 - 2=0的两个根,求logαβ+logβα的值 - 作业帮
项彭18365161661…… [答案] (lgα)2-lgα2-2=0 (lgβ)2-lgβ2-2=0 两式相减(lgα+lgβ)(lgα-lgβ)-2(lgα-lgβ)=0 (lgα+lgβ-2)(lgα-lgβ)=0 lgα+lgβ-2=0 (lgα-lgβ)=0 logαβ=lgα+lgβ=2 logβα=(lgα-lgβ)=0 logαβ+logβα=2
@房包2404：指数函数计算题化简 E=log (tan89°)+log (tan88°)+.+ log (tan1°) - 作业帮
项彭18365161661…… [答案] tan89=cot1 E=log(cot1)+log(cot2)+.+log(cot44)+log(tan45)+log(tan44)+...log(tan1) 首尾相加log(cot1)+log(tan1)=log(cot1*tan1)=0 log(tan45)=0 E=0
项彭18365161661…… 1、换个浏览器试试,比如谷歌浏览器 火狐狸浏览器; 2、先卸载系统原来的flash player,再去官网下载安装; 3、还不行,直接使用Mac版优酷客户端,在客户端上面看优酷视频.
@房包2404：log62+(log62)(log63)+(log63)2= - ----- -
项彭18365161661…… log62+(log62)(log63)+(log63)2=log62+(log62+log63)log63=log62+log63=1 故答案为:1
@房包2404：7^log<7>2=? -
项彭18365161661…… 答:7^ [log7(2)]=2 设7^[log7(2)]=x 两边取7的对数:log7 { 7^[log7(2)] } = log7(x) [ log7(2) ]*log7(7)=log7(x) log7(2)=log7(x) x=2
@房包2404：计算:2log5 10+log5 0.25= - ----- -
项彭18365161661…… 2log5 10+log5 0.25=log5 10^2+log5 0.25=log5 (100*0.25) =log5 25=2
@房包2404：已知函数f(x)=3的x次方,x2,则f(2+log32)=f(x)=3的x次方,x2, - 作业帮
项彭18365161661…… [答案] 2+log3(2)>2 ∴f(2+log3(2)) =f(2+log3(2) -2) =f(log3(2)) log3(2)
@房包2404：(log4 3+log8 3)(log3 5+log9 5)(log5 2+log25 2)= -
项彭18365161661…… (log2 3/log2 4+log2 3/log2 8)(log3 5/log3 3+log3 5/log3 9)(log5 2/log5 5+log5 2/log5 25)=[(5log2 3)/6][(3log3 5)/2][(3log5 2)/2] 然后全部换成以2为底的对数得上式=(5/6)(3/2)(3/2)[(log2 3/log2 2)(log2 5/log2 3)(log2 2/log2 5)]=15/8
@房包2404：25^(1/3log5^27+log5^2)= -
项彭18365161661…… 25^(1/3log5^27+log5^2)=(5^2)^[log5^(27^1/3)+log5^2]=(5^2)^[log5^3+log5^2]=(5^2)^(log5^6)=5^2log5^6=5^log5^(6^2)=36
@房包2404：设α,β是方程(lgx)^2 - lgx^2 - 2=0的两个根,求logαβ+logβα的值 - 作业帮
项彭18365161661…… [答案] (lgα)2-lgα2-2=0 (lgβ)2-lgβ2-2=0 两式相减(lgα+lgβ)(lgα-lgβ)-2(lgα-lgβ)=0 (lgα+lgβ-2)(lgα-lgβ)=0 lgα+lgβ-2=0 (lgα-lgβ)=0 logαβ=lgα+lgβ=2 logβα=(lgα-lgβ)=0 logαβ+logβα=2
@房包2404：指数函数计算题化简 E=log (tan89°)+log (tan88°)+.+ log (tan1°) - 作业帮
项彭18365161661…… [答案] tan89=cot1 E=log(cot1)+log(cot2)+.+log(cot44)+log(tan45)+log(tan44)+...log(tan1) 首尾相加log(cot1)+log(tan1)=log(cot1*tan1)=0 log(tan45)=0 E=0
