1/997x998+1/998x999+1/999=???
giúp với
Tính giá trị biểu thức: 1/997x998 + 1/998x999 + 1/999
tinh gia tri bieu thuc [1+1/100] * [1+1/99]*.....* [1+1/3] * [1+1/2]
tinh gia tri bieu thuc : 2+4+6+...+2010/1+2+3+...+2010
tinh gia tri bieu thuc (1+1/2)x(1+1/3)x(1+1/4)x...x(1+1/2013)
tinh gia tri bieu thuc
A=(1999*1998+1998+1997)*1+1/2:1/1/2-1/1/3
tinh gia tri bieu thuc (2/3x1/5+1/5) : (2/3:1/5-1/5) / 1/2 - 21/47
cho a R b =a*b/ a+b . Tinh gia tri bieu thuc cua : 13R7 - 12r4 . TINH gia tri cua bieu thuc tren ( 30 giay )
tinh gia tri bieu thuc : a ) : (1+2+3+4+ .............+97+98+99+100) : 5