1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56
= 1/4 + 1/20 + 1/30 + 1/42 + 1/56
= 3/10 + 1/30 + 1/42 + 1/56
= 1/3 + 1/42 + 1/56
= 5/14 + 1/56
= 3/8
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Các câu hỏi tương tự
Tinh nhanh:
1/6+1/12+1/20+1/30+1/42+1/56
Lam di nha ai lam nhanh thi minh tick!
Tính nhanh :A=1/6+1/12+1/20+1/30+1/42+1/56
Tính nhanh: A=1/6+1/12+1/20+1/30+1/42+1/56
tinh nhanh
1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
Tính nhanh:
A = 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56
Tính nhanh
8/9-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2
Tính
1. A= 1/2+1/6+1/12+/1/20+1/30+1/42+1/56
2. B = 3/2+5/6+7/12+-9/20+11/30-13/42+15/56
tinh giùm cái A= 1/2+ 1/6 + 1/12 + 1/12 + 1/30 + 1/42 + 1/42 + 1/56 + 1/72
bài 2: tính nhanh :
a) 3/8 + 7/12 + 10/16 + 10/24 b) 4/6 + 7/13 + 17/9 + 19/13 + 1/9 + 14/6
c) 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56