Đáp án:
Giải thích các bước giải:
Đáp án+Giải thích các bước giải:
`P(x)=4x^2+x^3-2x+3-x-x^3+3x-2x^2`
`=(4x^2-2x^2)+(x^3-x^3)-(2x+x-3x)+3`
`=2x^2+3`
Cho `P(x)=0` ta có :
`2x^2+3=0`
Do `2x^2>=0∀x`
`->2x^2+3>=3>0∀x`
`=>` vô nghiệm
It's becoming_______to find a job. * 1 điểm A. more difficult and more B. more and more difficult C. most and more difficult D. more difficult than. I met the waiters, several of……………..are university students. * 1 điểm A. them B. who C. that D. whom
Lúc bắt đầu soạn bài, thầy nhìn đồng hồ thấy hơn 1 giờ. Sau khi soạn được một vài bài thì nhìn lên đồng hồ thì thấy kim giờ và kim phút đổi chổ cho nhau. Biết rằng kim phút chưa vượt qua kim giờ, em có biết thầy bắt đầu soạn bài lúc mấy giờ hay không?
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IV. Rewrite the following sentences so that they have the same meaning as the first ones. Ex: This table is big This / It is a big table Ex: These tables are big These / They are big tables 1. That girl is beautiful. ____________ 2. These books are interesting __________________________ 3. This film is boring _______________________________ 4. This school is modern ________________________________ 5. Those desks are small _______________________________ 6. That house is ancient _______________________________
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