Sửa đề: 1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
=1-1/2+1-1/6+...+1-1/90
=9-(1-1/2+1/2-1/3+...+1/9-1/10)
=9-1+1/10=8+1/10=8,1
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Các câu hỏi tương tự
1/2 + 5/6 + 11/12 + 19/20 + 29/30 + 41/42 + 55/56 + 71/72 + 89/90 = ?
làm rõ ràng ra nha
1/2+5/6+11/12+19/20+41/42+55/56+71/72+89/90
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
GIÚP MK VỚI AI NHANH MK TICK
1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
26 tháng 9 2021 lúc 10:02
Tính nhanh:
1/2 + 5/6 + 11/12 + 19/20 + 29/30 + 41/42 + 55/56 + 71/72 + 89/90
A=1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90 = ?
A= 1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
A= 1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90+109/110