The page is temporarily unavailable
nginx error!
The page you are looking for is temporarily unavailable.
Please try again later.
Website Administrator
Something has triggered an error on your
This is the default error page for
nginx that is distributed with
It is located
/usr/share/nginx/html/50x.html
You should customize this error page for your own
site or edit the error_page directive in
the nginx configuration file
/etc/nginx/nginx.conf.The page is temporarily unavailable
nginx error!
The page you are looking for is temporarily unavailable.
Please try again later.
Website Administrator
Something has triggered an error on your
This is the default error page for
nginx that is distributed with
It is located
/usr/share/nginx/html/50x.html
You should customize this error page for your own
site or edit the error_page directive in
the nginx configuration file
/etc/nginx/nginx.conf.The page is temporarily unavailable
nginx error!
The page you are looking for is temporarily unavailable.
Please try again later.
Website Administrator
Something has triggered an error on your
This is the default error page for
nginx that is distributed with
It is located
/usr/share/nginx/html/50x.html
You should customize this error page for your own
site or edit the error_page directive in
the nginx configuration file
/etc/nginx/nginx.conf.已知实数a满足a2+2a-15=0，求-2-1÷2-2a+1的值．
蒋蛋疼有多疼40
-2-1÷2-2a+1=-o2(a+1)(a+2)=-2=2，∵a2+2a-15=0，∴（a+1）2=16，∴原式==．
为您推荐：
其他类似问题
先把要求的式子进行计算，先进行因式分解，再把除法转化成乘法，然后进行约分，得到一个最简分式，最后把a2+2a-15=0进行配方，得到一个a+1的值，再把它整体代入即可求出答案．
本题考点：
分式的化简求值．
考点点评：
此题考查了分式的化简求值，关键是掌握分式化简的步骤，先进行通分，再因式分解，然后把除法转化成乘法，最后约分；化简求值题要将原式化为最简后再代值．
解a²+2a-15=0a²+2a=15原式=1/(a+1)-(a+2)/(a-1)(a+1)×(a-1)²/(a+1)(a+2)=1/(a+1)-(a-1)/(a+1)²=(a+1)/(a+1)²-(a-1)/(a+1)²=(a+1-a+1)/(a+1)²=2/(a²+2a+1)=2/(15+1)=1/8
扫描下载二维码The page is temporarily unavailable
nginx error!
The page you are looking for is temporarily unavailable.
Please try again later.
Website Administrator
Something has triggered an error on your
This is the default error page for
nginx that is distributed with
It is located
/usr/share/nginx/html/50x.html
You should customize this error page for your own
site or edit the error_page directive in
the nginx configuration file
/etc/nginx/nginx.conf.}