=2x(2/2x4+2/4x6+...+2/96x98
=2x(1/2-1/4+1/4-1/6+...+1/96-/98)
=2x(1/2-1/98)
=2x24/49
=48/49
tick nha
=2x(2/2x4+2/4x6+...+2/96x98
=2x(1/2-1/4+1/4-1/6+...+1/96-/98)
=2x(1/2-1/98)
=2x24/49
=48/49
tick nha
tinh bang cach thuan tien nhat : 3/4 x 4/5 + 5/6 x 6/7 x 7/8
tinh bang cach thuan tien nhat
8,12 x 6 + 16,24 x 4 - 4,06 x 8
Tinh gia tri bieu thuc bang cach thuan tien nhat :
A= 1/10 x 2/9 x 3/8 x 4/7 x 5/6 x 6/5 x 7/4 x 8/3 x 9/2
Tinh bang cach thuan tien nhat:
a) 1/3 + 1/4 + 2/3 + 3/4
b) 1/2 + 1/3 - 1/5 + 1/6
c) 2/3 x 4/5 + 1/3 x 4/5
d) 2/3 x 4/5 - 1/3 x 4/5
144 x 4+18 x 46 x 8 - 44x 32 - 44x 58
Tinh bang cach thuan tien nha
tinh bang cach thuan tien nhat :
5,6 x 4 + 5,6 x3 + 5,6 x 2 + 5,6
nhanh do
tinh bang cach thuan tien nhat : 1+2-3-4+5+6-7-8+9+...+2013+2014-2015-2016
Tinh bang cach thuan tien:
0,8 x 96 + 1,6 x 2
Tinh bang cach thuan tien nhat:
a/ 7,8 x 34,5 + 15,5 x 7,8
b/ 3/7 x 11/5 + 4/7 x 11/5