1/20+1/30+1/42+...+1/72+1/90 =1/4.5+1/5.6+1/6.7+...+1/8.9+1/9.10=1/4-1/5+1/5-1/6+1/6-1/7+...+1/8-1/9+1/9-1/10=1/4-1/10=5/20-2/20=3/20
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Các câu hỏi tương tự
-1/20+ -1/30+ -1/42+ -1/56+ -1/72+ -1/90=?
(-1/20)+(-1/30)+(-1/42)+(-1/56)+(-1/72)+(-1/90)
1/20+ 1/30+ 1/42+ 1/56+ 1/72+1/90
-1/20+ -1/30+ -1/42+ -1/56+ -1/72+ -1/90=?
1/20+1/30+1/42+1/56+1/72+1/90+... TÍNH.?
A= -1/20 + -1/30 + -1/42 + -1/56 + -1/72 + -1/90 = ?
-1/20+-1/30+-1/42+-1/56+-1/72+-1/90
GIÚP MÌNH NHa
A=-1/20+-1/30+-1/42+-1/56+-1/72+-1/90+-1/110+-1/132
A = - 1/20 + - 1/30 + - 1/42 + - 1/56 + - 1/72 + - 1/90