a)

P(x)= ( x^3-x^3) + ( -2x^2 + 2x^2) + ( 5x - 3x) + ( -3 +5)

P(x)= 2x+2

b)

Q(x)= x.( x^3 - 2x^2 + 5x -3) -3 ( x^3 - 2x^2 + 5x -3)

Q(x)= ( x^4 - 2x^3 + 5x^2 -3x) -( 3x^3 - 6x^2 + 15x-9)

Q(x)= x^4 - 2x^3 - 3x^3 + 5x^2 + 6x^2 -3x - 15x + 9

Q(x)= x^4 - 5x^3 + 11x^2 - 18x + 9

c)

Để tìm nghiệm của P(x), ta cho P ( x) = 0:

2x + 2= 0

2x= -2

x=1

bài 1:

a)A=0,1,2,3,4,5,6,7,8,9

số phần tử của tập A là 10

b)

kết quả có lợi: 2,3,5,7

P(b)=0,4

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