Tổng các giá trị của x thỏa mãn $ 3{{x}^{5}}-10{{x}^{4}}+15{{x}^{3}}-3{{x}^{2}}+10x-15=0 $ là
A.$ -3 $.
B.$ 3 $.
C.$ 1 $.
D.$ 2 $.

Cho $ {{x}^{2}}-4{{y}^{2}}-2x-4y=(x+2y)(x-2y+m) $ với $ m\in R $ . Chọn câu đúng.
A. $ 2 < m < 4 $ .
B. $ m > 4 $ .
C. $ 1 < m < 3 $ .
D. $ m < 0 $ .

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions
Many animals are born in captivity. Resultantly, they do not always breed well.
A.imprisonment
B.freedom
C.lock
D.detention

Chọn câu sai.
A. $ {{x}^{2}}-5y+x-5xy=(x+1)(x-5y) $ .
B. $ {{a}^{3}}-4{{a}^{2}}+a-4=(a-4)({{a}^{2}}+1) $ .
C. $ {{x}^{2}}{{y}^{2}}+{{y}^{3}}+a{{x}^{2}}+ay=({{y}^{2}}+a)({{x}^{2}}+y) $ .
D. $ m{{x}^{2}}-nx-mx+n=(x-1)(mx+n) $ .

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions
Scientists are trying to find an energy that consumes less fuel.
A.eat up
B.waste
C.use
D.destroy

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Governments and scientists are worried about how to ______________ waste safely.
A.oppose to
B.pose
C.dispose of
D.give away

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions
Modern building are designed to maximize natural light.
A.diminish
B.absorb
C.let
D.increase

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
There is little _________ of things improving soon.
A.probabilities
B.probability
C.probably
D.probable

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_____________batteries or solar chargers are some of the solutions to the lack of energy.
A.repeatable
B.rechargeable
C.reversible
D.returnable

Chọn đáp án đúng
Điền chữ số thích hợp vào chỗ chấm
$ 4d{{m}^{2}}=...c{{m}^{2}} $
A. $ 40000 $ .
B. $ 400 $ .
C. $ 4000 $ .
D. $ 40 $ .