Câu hỏi 16
Tính:
$1{,}111+2{,}212+3{,}313+4{,}414+5{,}515+6{,}616+7{,}717+8{,}318+9{,}419+10{,}520+11{,}621+12{,}722+13{,}823+14{,}924$
$1{,}111+2{,}212+3{,}313+4{,}414+5{,}515+6{,}616+7{,}717+8{,}318+9{,}419+10{,}520+11{,}621+12{,}722+13{,}823+14{,}924$