Doan=Range
Func(a,b)=a^2+b^2
Tong=Summa
B(X)=C(8,x)*0.5^8+2
F(x)=(x^3-x)*x
P(x)=2.7^x/x!*2.718281828^(-2.7)
Rand=Random(100)
BB(n)=Array(C(n,k),[k,0,n]) // khai trien new ton
MySin(x)=x-x^3/6+x^5/120 // Dinh nghia gan dung ham Sin
B1=Sum
