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
tin n thuoc z de phan so 3n+1 tren 4-n la nguyen
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
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
A=\(\left\{n\in Z|\frac{3n+2}{2n-1}\in Z\right\}\)
xac dinh cac phan tu cua A
cho 2 so tu nhien co 2 chu so. biet so lon hon so be 16 don vi. ghep 2 so do ben canh nhau ta duoc 2 so co 4 chu so co tong la 5454 . tim so lon
Tich cac so tu 1 den 50 co bao nhieu chu so 0 o tan cung
tim mot so tu nhien nho nhat co 3 chu so biet :
so do chia 18 du 8 chia 30 du 20 chia45 du 35