1) Ket qua khi rut gon phan thuc \(\dfrac{x^2+2x+1}{x^3+1}\) la:

1) Thuc hien phep tinh cong 2 phan thuc \(\dfrac{2x}{x^2-2x+1}+\dfrac{x+1}{x-1}\) duoc ket qua la:

A. \(\dfrac{x^2+2x+1}{\left(x-1\right)^2}\)             B. \(\dfrac{x^2+2x-1}{\left(x-1\right)^2}\)      C. \(\dfrac{x^2-x-1}{\left(x-1\right)^2}\)           D. \(\dfrac{x^2-2x-1}{\left(x-1\right)^2}\)

Mot loai dong oxit 1 mau den co khoi luong mol p/tu la 80g. Oxit nay co thanh phan la 80% dong va 20% oxi. Tim c/thuc hoa hoc cua loai dong oxit tren .

hay viet phan thuc \(\dfrac{3}{x-2}\)duoi dang phan thuc co mau so la x^2-2x

mot phan thuc co gia tri bangh 0 khi gia tri cua tu thuc bang 0 con gia tri cua mau thuc khac 0. tim cac gia tri cua x de gia tri cua phan thuc \(\dfrac{x^2-10x+25}{x^2-5}\)bang 0

hop chat A gom 1 nguyen tu X lien ket voi 2 nguyen tu Y. Biet phan tram khoi cua X trong hop chat la 50% va phan tu khoi cua hop chat la 80 dvC. Xac dinh cong thuc hoa hoc cua hop chat A

tinh tong cac phan so

-du lieu dau vao la file tong.inp gom 1 dong duy nhat chua cac cap so nguyen duong tuong ung voi cac cap tu so, mau so (mau khac 0) cua cac phan so

- du lieu ra la file tong.out 2 so nguyen ghi tren 1 dong tuong ung la tu so va mau so cua phan so ket qua da toi gian

vd:

1 2 2 4 3 8 11 8

1 3 5 6 3 4 2 6 9 4

tong cua 1 so tu nhien va 1 so thap phan la 2102.75 khi thuc hien phep tinh 1 ban quen viet dau phay nen duoc ket qua la 10691 . Tim so tu nhien 

Phan tu mARN truong thanh co chieu dai 408 nm co ti le cac loai nu A:U:G:X =4:2:3:1 va ma ket thuc la UGA. Khi tong hop 1 chuoi polipeptit, so nu co o cac doi ma cua tARN loai A,U,G,X la?