Câu hỏi của me5tui

`a) 101+100+99+98+...+2+1=(101+1).101/2=5151``101-100+99-98+...+3-2+1= (101-100)+(99-98)+...+(3-2)+1`Số số cặp: `(101-3):2+1=50``A=5151/(1.50)=5151/50``b) 3737.43-4343.37=3737.43-43.101.37=3737.(43-43)=3737.0=0``=> B=0/(2+4+6+...+100)=0`Câu trả lời: `a) 101+100+99+98+...+2+1=(101+1).101/2=5151``101-100+99-98+...+3-2+1= (101-100)+(99-98)+...+(3-2)+1`Số số cặp: `(101-3):2+1=50``A=5151/(1.50)=5151/50``b) 3737.43-4343.37=3737.43-43.101.37=3737.(43-43)=3737.0=0``=> B=0/(2+4+6+...+100)=0`