tim cac so tu nhien n de cac phan so sau la phan so toi gian
2n+3 tren 4n+1
A=\(\left\{n\in Z|\frac{3n+2}{2n-1}\in Z\right\}\)
xac dinh cac phan tu cua A
Cho A la tap hop gom huu han cac phan tu' Ki hieu n(A) la so phan tu cua tap A. Sap xep cac so sau theo thu tu tang dan
a) n(A), n(A hop B), n(A giao B)
b)n(A hieu B), n(A)+n(B), n(A hop B)
tim so tu nhien n de A=21n+3 tren 6n+4rut gon duoc
Tim so nguyen x de cac phan so sau co gia tri nguyen:
a) \(\frac{13}{x-5}\) b)\(\frac{x+3}{x-2}\) c)\(\frac{2x}{x-2}\)
GIUP MINH NHA MAI THI HKII ROI
tren tia ox lay 2 diem a b sao cho ob=12cm oa=6cm
a. diem A co phai la trung diem cua doan thang OB ko
b. goi I la trung diem cua doan thang AB. tinh do dai doan thang OI
c. M la diem thuoc tia doi cua tia OB. biet khoang cach giua hai diem M va I la 12cm
voi 4 chu so 4 hay cong , tru , nhan , chia de bang ket qua la 20
khi chia so a cho 9 duoc so thuong la so co hai chu so va co so du la 5 hoi phai bot so a di bao nhieu don vi de phep chia la phep chia co so du la 5 va thuong giam di 1 don vi
Tong cua mot so tu nhien va mot so thap phan la 543,8.Khi thuc hien phep cong lan da quaen viet dau phay cua so thap phan nen co ket qua la 812. Tim 2 so do