Các số nguyên thỏa |x| < 2013 là
\(x\in\left\{-2012;-2011;....-1;0;1;2;...;2011;2012\right\}\)

Tổng của chúng = (-2012 + 2012) + (-2011+2011) +...+ (-1+1) +0 =0

I don't know:Tôi không biết

x^3+27+(x+3)(x-9)=(x+3)(x²+3x+9)+(x+3)(x-9)

=(x+3)(x²+3x+9+x-9)

=(x+3)(x²+4x)

=x(x+3)(x+4)

Hoàn thành mẩu đối thoại với các từ sẵn trong khung

Nam: I don't have my timetable

What do we have today?

Lan:It's Monday.We have Maths,English,Literature and History.

Nam: What time do we have English?

Lan:We have it from 9.35 to 10.10

Nam:When do we have geography?

Lan:We have it on Tuesday and Friday.

Nam:Does Nga have History today?

Lan:No,she doesn't

A=(100-1).(100-2).(100-3)...(100-n) có 100 thừa số nên n=100

=>A=(100-1).(100-2).(100-3)...(100-100)=(100-1).(100-2).(100-3)...0=0

Let's go to the beach and have a good time

Let's go there to the beach and have a good time

We often come back our hometown in the July