Tìm x biết
1/3 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56 - 1/72 - 1/90 - 1/110 = x - 5/13
tìm x :
1/3 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56 - 1/72 - 1/90 - 1/100 = x - 5/13
Tính
a) 9/110-1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
Tính: B=1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
A=1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
a) [ 6.(-1/3)^3 - 3. (-1/3)+ 1] - (-1/3 - 1)
b) ( 6^3+ 3. 6^2+ 3^3 ) : 13
c) 9/10-1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
tính -1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
9/10-1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
