Giải PT: \(\left\{{}\begin{matrix}x+y+z=3\\x^3+y^3+z^3=3\end{matrix}\right.\)

Giải PT nghiệm nguyên : \(8x^2-5y^2+10x+4=0\)

Tìm \(a\in Z\) để PT sau có nghiệm nguyên:
a/ \(x^2-\left(3+2a\right)x+40-a=0\)

b/ \(x^2-3ax+3-a=0\)

c/\(ax^2-\left(a+3\right)x+a+2=0\)

d/\(\left(a+1\right)x^2-3\left(a+1\right)x+4a=0\)

Tìm nghiệm nguyên của PT: \(x\left(1+x+x^2\right)=4xy\)

I can remember a time. There was no television at that time

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According to some researchers, the emphasis in education in the next few years would be ______the development of student's computer skills.

A. to

B. at

C. on

D. with