phaân tích thành nhân tử: a^3 -b^5 -3a + 3b

điền từ: she's struggling to combine (mother)... and a career as a lawyer

điền từ: she has a highly (invent) mind

điền từ thích hợp vào chỗ trống: technology and science have (gradual)... changed the place of buffalos on the paddy fields

Combine each pair of sentences into one:

1. Name the two young lovers. Their story was made into a play by shakespeare.

2. Galileo made a telescope. He could observe the sky through it.

3. He came into the room and put the letter on the desk. there was a wastebasket under it.

Tính:

\(2\dfrac{1}{547}\cdot\dfrac{3}{211}-\dfrac{546}{547}\cdot\dfrac{1}{211}-\dfrac{4}{547\cdot211}\)

tìm a,b,c,d để với mọi x ta có:

(ax + b)(x^2 + cx + 1) = x^3 - 3x +2

tìm a,b,c,d để với mọi x có:

x^4 + ax^2 + b = (x^2 - 3x + )(x^2 + cx + d)

phân tích:

a) x^4 - 4x^2 + 8x - 8

b) a^2 + b^2 + a^2b^2 + ab - a - b

c) x^2y + xy^2 + x^2z + y^2z + yz^2 + 2xyz

a) Cho a^2 + b^2 + c^2 + 3 = 2(a+b+c). Chứng minh a=b=c=1

b) Cho (a+b+c)^2 = 3(ab+bc+ac). Chứng minh a+b+c

c) Cho (a+b)^2 + (b-c)^2 + (c-a)^2 = (a+b-2c^2) + (b+c-2a^2) + (c+a-2b)^2. Chứng minh a=b=c