101+100+........+1/101-100+99-98+..........+3-2+1
=(101+1)*101:2 / (101-100)+..................+(3-2)+1
=51*101 / 1+1+1+..........+1( có 51 số 1)
=51*101/51
=105
vậy ........................................................................................
=(101+1)*(101-1+1):2/(101-100)+(99-98)+....+(3-2)+1
=102*101:2/1+1+1+...+1+1(có 51 số 1)
=5151/51
=101
A=101+100+99+98+...+3+2+1/101-100+99-98+...+3-2+1
B=3737.43/4343.37
tính
A=101+100+99+99+98+.........+3+2+1
---------------------------------------------------------------
101- _100+99-98+.....+3-2+1
\(\frac{101+100+99+98+.....+5+4+3+2+1}{101-100+99-98+...+5-4+3-2+1}\)
100 + 99/2 + 98/3 + .......... 2/99 + 1/100 : 100/2 + 100/3 +.......+ 100/100+100/101
\(\frac{101+100+99+...+3+2+1}{101-100+99-98+...+3-2+1}\)
Tính nhanh
Tinh
a) ( 124 x 237 + 152 ) : (870 + 235 x 122 )
b) 101 +100 + 99 + 98 + ...3 + 2 + 1
c) 101-100 + 99 -98+...3-2+1
1+2-3-4+5+6-7-8+...+97+98-99-100+101
1-2+3-4+5-6+...+98+99-100+101
A=1+2+3+4+5+6...95+96+97+98+99+100+101 = ?
