A=1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8+1/8.9+1/9.10
A=1/2-1/3+1/3-1/4+1/4-1/5+...+1/9-1/10
A=1/2-1/10
A=2/5
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A=1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8+1/8.9+1/9.10
A=1/2-1/3+1/3-1/4+1/4-1/5+...+1/9-1/10
A=1/2-1/10
A=2/5
A = 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90 + 1/110=?
1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2 = ?
Tính : B=1/90-1/72-1/56-1/42-1/30-1/20-1/6-1/12
S=1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110
9/10-1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2 = ?
9/10 +1/90++1/72+1/56+1/42+1/30+1/20+1/12+1/6+1/2
Tính D biết 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 hợp lí
tính giá trị biểu thức:B=1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90