\(A=\frac{1}{3}.\left(\frac{3}{2.4.6}+\frac{3}{4.6.8}+...+\frac{3}{22.24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{4.6}+\frac{1}{4.6}-\frac{1}{6.8}+...+\frac{1}{22.24}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{24.26}\right)\)
\(A=\frac{1}{3}.\frac{77}{624}\)
\(A=\frac{77}{1872}\)
\(A=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{90}.\)
tính A
On Internet now, people are arguing about this little math problem so I decided to post this:
Solve:
\(9-3\div\frac{1}{3}+1\)
tính rồi rút gọn
a] 3/5 chia 3/4
b]1/4chia 1/2
tính nhanh
2/5 x 8/7 - 2/5 x 1/7
điền chỗ trống 1 tính từ sở hữu(My,his,her,their,our,its,your)
1.Those fish are swimming in......................tank.
2.I'm Mary and there are four people in...............family.
3.The bird is sleeping in............................cage.
4.Linda often goes shopping with..................boyfriend at weekend.
5.My sister and I hate Math,.................................favorite subject is English.
6.Do you and your husband usually take...............children to school by car?
7+8.Mr.John and..................sons are painting............................house at present.
cảm ơn các bạn đã giúp mình thanks
tính tổng : A = 1/2 + 5/6 + 11/12 + 19/20 + 29/30 + 41/42 + 55/56
câu 10 : tính nhanh : a) 8 phàn 25 + 7 phần 8 + 7 phần 25 + 1 phần 8 =
b) tính 11 phần 7 x 3 phần 22 : 5 phần 28 =
ai làm đúng mình tích cho nhé thanks
điền vào chỗ trống 1 tính từ sở hữu(My,his,her,their,our,its,your)
1.Jack and............................wife are going on holiday now.
2.The lice are looking for...............food at present.
3.I'm from Canada and.........................name is Lily.
4.I have a lovely dog. ........................................name is Tom.
5.Hoang and Tu have Music once a week;it's......................favorite subject.
6+7.Hoa loves watching TV but.............................brother loves going out with.....................friends
1 có nửa chu vi là 36cm , rộng bằng \(\dfrac{4}{5}\) chiều dài .tính diện tích hcn đó
giải
