=\(\frac{1}{1.2}+\frac{1}{2.3}+..+\frac{1}{7.8}\)
=1-1/8
=7/8
D=1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8
=1-1/2+1/2-1/3+1/3-1/4+.........+1/7-1/8
=1-1/8=1/8
Tinh nhanh:
1/6+1/12+1/20+1/30+1/42+1/56
Lam di nha ai lam nhanh thi minh tick!
Tinh :
A=\(\left(1+\frac{1}{1.3}\right)\left(1+\frac{1}{2.4}\right)\left(1+\frac{1}{3.5}\right)....\left(1+\frac{1}{2014.1016}\right)\)
Giup minh trinh bay ca cach lam nua nha!
Ai chua doc het de va ko hieu thi vao phan "Doc them" se ro
Thanks
Tinh :
A=\(\left(1+\frac{1}{1.3}\right)\left(1+\frac{1}{2.4}\right)\left(1+\frac{1}{3.5}\right)......\left(1+\frac{1}{2014.2016}\right)\)
Giup minh trinh bay ca cach lam nua nha!
Ai chua doc het de va ko hieu thi vao phan "Doc them" se ro
Thanks
Tinh gia tri cua bieu thuc \(D=\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+\frac{1}{21}+\frac{1}{28}+\frac{1}{36}+\frac{1}{45}\)
Nho giai va trinh bay cach lam cho minh luon nha ^_^
De thi day. (*^﹏^*)
Toan : tinh gia tri bieu thuc A =1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
Ngu van : dat mot cau ve Hoán dụ. Cau : Mèo la yen toi dat cho nó ( Kiều Phuong) co phai la Ẩn dụ k?
Gdcd : toi da gặp dc 1000 con sếu : toi ước mình sẽ co tính kien trì va dieu uoc do da tro thanh su that. Hoi tai sao no co the tro thanh su that co phai la do phep mau nao do. Hay giai thich.
Lịch su : Hắc Đế la ten cua.....
Tieng Anh:hãy viet cong thuc khi hoi ai do lam gi trong thoi gian ranh roi
Sinh hoc:De biet dc mot cay duong xi ta dua vao dac diem nao?
Vat ly: hay giai thich tai sao khi do nc nong vao coc nuoc day lai de vo hon coc nuoc mong?
Minh se cham hat vao 1 hoac 2 tuan nua. Bn nao dc diem 10 minh cho 6 tick. Diem 9 minh cho 3 tick. Diem 8 minh cho 1 tick
Bn nao tranh thi lam nha... Neu ai thay hay thi kb voi minh nhe
Thuc hien cac phep tinh
A,56:54+23×22-12017
ghi cach lam , loi giai ra nhe,trinh bay ro ra nhe!! Thank pho watching
1. Tim so chia a biet khi chia cho 4 du 3, chia cho 7 du 9, chia cho 19 du 13. hoi so do chia cho 1292 du bao nhieu ? ( neu cach trinh bay)
2. Tim so a biet a khi chia cho 4 du 2, chia cho 15 du 12, chia cho 17 du 16. Hoi a chia cho 1019 du bao nhieu? (neu cach tinh bay )
Tinh:
\(B=\frac{\frac{1}{7}+\frac{1}{23}-\frac{1}{1009}}{\frac{1}{7}+\frac{1}{23}-\frac{1}{1009}+\frac{1}{7}.\frac{1}{23}.\frac{1}{1009}}\)
Trinh bay cach lam nua nhe
Co gi ko hieu thi vao phan doc them
1:chi ra tinh chat dac trung cua cac phan tu cua no
C={2;6;12;20;...;72}
2:Cho m={10;11;12;13}
a)viet tat ca cac tap hop con cua tap hop m.Viet duoc tat ca bao nhieu phan tu?
b)voi cac tap hop con cua m ma moi phan tu cua no deu la so le
3;ket qua dieu tra lop 6a co 20 em thich choi cau long, 17 em thich choi bong da. Con 10 em thich choi ca 2 mon cau long va bong da. Hoi lop do co bao nhieu hoc sinh?