Cau 1: Tim n biet : 5/8 + 5/24 + 5/48 + 5/80 + ... + 5/2n + 2 . 2n + 4 = 189/112
Cau 2 : Cho A = 1 + 1/1.2 + 1/1.2.3 + ... + 1/1.2.3...2014. So sanh A voi 2
Cau 3 : Tim n biet : 5/3 + 5/15 + 5/35 + 5/63 +...+ 5/2n + 1 . 2n + 3 = 172/69
co ai lam duoc cau lay ko
a / 5 .2^2 + ( x+ 3 ) = 5^2
b/ 4 . ( x - 5 ) - 2^3 = 2^4 . 3
co ai lam duoc cau lay KO>_> hi hi . . . lam duoc thi cho dung KO
(1 + 3 + 5 + 7 + . . . +2001 ) . (135135 . 137137 )
phai that la nha nha hi hi . . . > _ >
71 + (26 -3x) ; 5 =75
mik cũng biet cau tra loi ai giai duoc cau nay thi se co like
Cau 1 : cho 3 duong thang doi 1 cat nhau tao thanh 3 giao diem phan biet .Hoi co bao nheu tia co goc la 1trong 3 giao diem do
Cau 2: Ve n tia phan biet chung gốc . Biet rang tren hinh co 36 góc .Tìm n
Cau 3: tim p/s bang 20/39 .Biet UCLN cu tu va mau nau bang 36
Cau 4 : Tap hop gia tri x thoa man |x+3|+|x+4|=1
Cau 5: Trong 1 buoi giao luu van nghe , h/s nu chiem 2/5 ,trong do co 3/8 la h/s lop 6.Trong so h/s nam co 2/9 la hoc sinh lop 6. Tinh so h/s lop 6 .Biet so h/s trong khoang tu 130 den 200
Cau 6: ti so cu hai so bang 2:7 neu them 35 vao so thu 1 thi ty so giua 2 so =11:14. Tinh so > hon
Cau 7 : So phan tu cua tap hop x thoa man
11-x+|x+2|=0
cau 8: 1 o to di quang duong AB voi van toc 40km/h luc ve di voi van toc 50 km/h . Time ca di lan ve =4h30 .tinh AB
Cau 9 : Can it nhat bao nhieu diem de khi noi lai ta duoc 4hinh tam gia
Minh viet tat nen hoi kho doc
ban nao giai duoc bao nhieu cau thi duoc bay nhieu tick
Cau 1: Co tat ca bao nhieu so co 3 chu so ma trong moi so co duy nhat 1 chu so 5.
Cau 2: Biet rang 3n+1 va 5n+4 (n thuoc N) la hai so khong nguyen to cung nhau. Khi do UCLN cua 3n+1 va 5n+4 la bao nhieu.
Cau 3: Tim cap (x;y) nguyen am thoa man:xy+3x+2y+6=0 va lxl+lyl=5.
Nguoi ta lay 1 to giay xe thanh 5 manh, sau do lai lay 1 so manh nay xe nho hon... Hoi sau 1 so lan tiep tuc xe nhu vay, lieu ta co the duoc :
1. 2001 manh 2. 2002 manh
Cu giai di. Ai dung ta tick cho mac du ta da biet cach giai. DO VUI THOI !
BAI 1:
Tim so tu nhien n biet rang 13 chi het cho n - 1
BAI 2;
Ve hai tia doi nhau Ox va Oy , lay diem A thuoc tia Ox , lay diem B thuoc tia Oy sao cho OA = 2 cm , OB = 5 cm
a) Diem O co bam giua A va B khong ? Vi sao ?
b) Tinh do dai AB
c) Lay diem I la trung diem cua doan thang OB . Tinh do dai AI
1 chia het cho x
-2 chia het cho x
1 chia het cho(x+7)
4 chia cho(x-5)
(x+7+1) chia het cho(x+7)
(x+8)chia het(x+7)
con cac cau sau ai biet ho minh nhe