\(A<1+\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{49.50}=1+\frac{2-1}{1.2}+\frac{3-2}{2.3}+\frac{4-3}{3.4}+...+\frac{50-49}{49.50}\)

\(A<1+1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{49}-\frac{1}{50}=2-\frac{1}{50}<2\)

C1 : = ( 3,57 + 2,43 ) x 4,1 

= 6 x 4,1

= 24,6

C2 : = 14,637 + 9,963

= 24,6

can 80 trai de dc 4kg

k mk nha

Viet doan van (5-7cau)lam sang to luan diem"Dai La la thang dia xung la kinh do cua de vuong muon doi"

viet doan van (12-15 cau)trinh bay cam nhan cua em ve kho tho thu nhat bai Nho Rung trong do co su dung 1 cau phu dinh 1 cau cam than.