cau 1: Cho A= \(\frac{100^{2014}+2}{3}-\frac{100^{2015}+17}{9}.\)tong cac cua so cua B=-9A

Cau 2: So sanh A=\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+........+\frac{1}{100.101}\)voi 1 ta doc A....1

Cau 3 : Cho bon so a,b,c,d sao cho a+b+c+d khac 0 . Biet \(\frac{b+c+d}{a}=\frac{c+d+a}{b}=\frac{d+a+b}{c}=\frac{a+b+c}{d}=k\). Vay k=

Cau 4 : so cac so nguyen am x thoa man \(x^{2015}=\left(-2\right)^{2014}\)

Cau 5; tim x,y,z biet \(\frac{x}{y}=\frac{10}{9},\frac{y}{z}=\frac{3}{4}\)va x-y+z=78

Cau 6: tap hop cac so co ba chu so chia het cho 18 va tong cac chu so ti le voi 1;2;3 la

Cau 7: gia tri cua tong S=1.2+2.3+.....+49.50 la S=

Cau 1: So gan dung cua a = 2,57656 co 3 chu so dang tin viet voi dang chuan la?

Cau 2: Trong 4 lan can hoa chat, ta thu duoc ket qua voi do chinh xac 0,001g : 5,382g : 5,384g : 5,386g. Sai so tuyet doi va chu so chac (viet theo thu tu tuong ung) cua ket qua nay la?

Cau 3: Cho gia tri gan dung cua 8/17 la 0,47. Sai so tuyet doi cua 0,47 la?

Cau 4: Cho gia tri gan dung cua 3/7 la 0,429. Sai so tuyet doi cua 0,429 la?

Cau 5: Qua dieu tra, so dan o tinh B la 2.731.425 nguoi voi sai so uoc luong ko qua 200 nguoi. Cac chu so ko dang tin la hang nao?

Giup voi minh can sieu gap luon! Cam on moi nguoi nhieu nhieu