Question

[chipukute]

A= 1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90+109/110

GIUP MK NHA AI NHANH NHAT MK TICH CHO

bai 2 :xy,mn-0,xy=19,94

Answer 1

[Quỳnh]

A = \(\frac{1}{2}+\frac{5}{6}+\frac{11}{12}+......+\frac{109}{110}\)

A = \(1-\frac{1}{2}+1-\frac{1}{6}+1-\frac{1}{12}....+1-\frac{1}{110}\)

A = \(10-\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+....+\frac{1}{110}\right)\)

A = \(10-\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+....+\frac{1}{10}-\frac{1}{11}\right)\)

A = \(10-\left(1-\frac{1}{11}\right)\)

A = \(10-\frac{10}{11}\)

A = \(\frac{100}{11}\)

Answer 2

[chipukute]

ai giup mk voi!!!! mk can gap