1. Has your mother ever been(your mother / ever be) ... to Australia ? Yes, she (go)went ... there with my father last year.
2. The Olympic Games (be) are ... held every four yeas
1. Has your mother ever been(your mother / ever be) ... to Australia ? Yes, she (go)went ... there with my father last year.
2. The Olympic Games (be) are ... held every four yeas
co hai voi nuoc cung chay vao 1 be .biet de chay duoc nua be . voi a mat 2 gio. voii b mat 3 gio
a. hoi trong 1 gio ca hai voi chay bao nhieu phan cua be
b. hỏi bé cần thời gian cả hai vòi chảy được bao nhiêu bao nhiêu
Tinh nhanh neu co the:
\(2-\dfrac{2}{3+\dfrac{1}{2}}\)
\(\dfrac{1-\dfrac{1}{\dfrac{3}{4}+1}}{3}\)
a,Tim so nguyen n de bieu thuc A=8n-9/2n+5 nhan gia tri nguyen.
b,Chung minh1/n.1/n+4=1/4.(1/n-1/n+4)
CAC BAN OI GIUP MINH VOI MAI MINH PHAI KIEM TRA RUI MA BAI KHO QUA CAC BAN OI.CAC BAN NHO GIAI NHANH NHANH GIUM MINH NHE. MINH THE MINH SE TICK CHO.MINH KHN KHOANCAU XIN CAC BAN DO.
4 phần 9 chia (âm 1 phần bảy ) = 6-5 phần 9 : ( âm 1 phần bảy ) hellp my
Tìm x, y \(\in\) Z biết :
a) \(\dfrac{x}{y-1}=\dfrac{2}{-3}\)
b) \(\dfrac{1}{x}+\dfrac{1}{y}=\dfrac{1}{2}\)
Bài 2:
Chứng minh rằng \(\dfrac{1}{2^2}\)+\(\dfrac{1}{3^2}\)+\(\dfrac{1}{4^2}\)+...+\(\dfrac{1}{n^2}\)< 1 ( n \(\in\) Z, n \(\ge\) 2)
Chứng minh: P, Q tối giản với mọi n\(\in\)Z
P=\(\dfrac{2n+1}{2n^2-1}\)
Q=\(\dfrac{n^3+2n}{n^4+3n^2+1}\)
they sent me a present last week
CHUYỂN SANG CÂU BỊ ĐỘNG
tìm x \(\in\)N
\(\dfrac{1}{3}\) + \(\dfrac{1}{6}\)+\(\dfrac{1}{10}\)+....+\(\dfrac{2}{x\left(x+1\right)}\)=\(\dfrac{2000}{2002}\)