= 3.(1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110)
= 3.8/33
= 8/11
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Các câu hỏi tương tự
tính nhanh:3/12+3/20+3/30+3/42+3/56+3/72+3/90+3/110
tính nhanh:
3/12+3/20+3/30+3/42+3/56+3/72+3/90+3/110
3/6 x 8/12 x 15/20 x 24/30 x 35/42 x 48/56 x 63/72 x 80/90
Tính nhanh
a, tính tổng
1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/110 + 1/132
b, tính nhanh
( 3/29 - 1/5 ). 29/3
3/2+7/6+13/12+21/20+31/30+43/42+57/56+73/72+91/90
3/2 - 5/6+ 7/12- 9/20 +11/30-13/42 +15/56 - 17/72+ 19/90
3/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
Tính nhanh tổng:
a, S=1 - 1/5 +7/12 -9/20 + 11/30 - 13/42 + 15/56 + 19/90 - 21/110 + 23/132
b, P=21 * (4/1*3 - 8/3*5 + 12/5*7 - 16/7*9 + ... + 36/17*19 - 40/19*21 ( dấu * là dấu nhân nhé)
Tính nhanh :
a. 5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
b. 1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90+109/110
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