Các b giúp mình với ạ Giải pt : (X^2-2x)^2+(x-1)^2-13=0

Điền vào chỗ trống với hình thức chính xác của từ trong chữ viết hoa. Mình cảm ơn ạ.

Ai có thể Hướng dẫn cách In hai mặt. Ở Word 2007và Word 2010

E18. Cho hình chóp S.ABC có tam giác ABC vuông tại A, AB=a, BC=2a. Các mặt bên cùng hợp với đáy một > góc 60 độ. H là hình chiếu của S trên (ABC). a)Tính SH=? b) tính góc giữa (SAB) và (SAC)

mọi người giúp mình cấu 9 ý c giải chi tiết nhá

tìm lim( $\sqrt[]{n^2+2n}^{}$ - $\sqrt[3]{n^3+2n}$ )

REVISION FOR THE MID SECOND TERM TEST - Grade 10 School year: 2019 - 2020 A. CONTENT: I. Phonetics • Pronunciation of some vowels and consonants • Stress patterns  Stress in two - syllable words  Stress in more than two - syllable words II. Vocabulary: Words learned from Unit 6 and 7 on topics: • Gender equality • Cultural diversity Synonyms and Antonyms III. Grammar: - Passive voice - Modal verbs: active and passive, modal verbs + have done - Comparisons - Articles B. PRACTICE EXERCISES PHONETICS I. Choose the word whose underlined part is pronounced differently from that of the others. 1. A. gender B. enrol C. preference D. secondary 2. A. aware B. family C. planet D. married 3. A. sue B. spend C. sure D. pursue 4. A. equal B. women C. eliminate D. example 5. A. female B. parent C. baby D. age 6. A. birth B. other C. youth D. think 7. A. diverse B. ritual C. bridesmaid D. decisive 8. A. ceremony B. prosperous C. prestige D. present (n) 9. A. propose B. approval C. groom D. superstition 10. A. head B. spread C. cream D. bread II. Choose the word whose stress is placed differently from that of the others. 1. A. maintain B. perform C. prefer D. offer 2. A. enrol B. happen C. pursue D. affect 3. A. college B. woman C. mistake D. housework 4. A. hunger B. police C. parent D. courage 5. A. influence B. typical C. dependent D. character 6. A. knowledge B. married C. bridesmaid D. exchange 7. A. personal B. proposal C. cultural D. several 8. A. superstitious B. complicated C. situated D. interestingly 9. A. identify B. disadvantage C. technology D. eliminate 10. A. introduce B. understand C. consider D. entertain VOCABULARY & GRAMMAR III. Give the correct form of the word. 1. My mother always chooses a favorable time for the important occasion. She is rather__________. (superstition) 2. A lot of people choose a ____________date for occasions such as wedding, funeral and house moving days. (favour) 3. Vietnamese people always remember their___________ because they believe that what they have had nowadays has inherited from their ancestors. (ancestral) 4. As a countries situated in Asia, where many _______________ and legends originate, Vietnam has also kept various superstitious beliefs about daily activities. (mysterious) 5. If this person is rich, prestigious or happy, then the family will have good___________ that year. (unfortunately) 6. Cultural ________ is obvious because each country in the world has various traditions and customs. (diverse) 7. It is believed that there are some ______________ shared by most American. (characterize) 8. Americans value ___________and do not like to be dependent on other people. (free) 9. Gender discrimination should be ____________ so that everyone has equal opportunities in education. (elimination) 10. Equality for everyone in __________________, ______ and medical care is the target of every government. (educate/ employ) 11. My mother gave __________ to boys over girls. (prefer) 12. She paid a heavy price to win ______________ at work. (equal) 13. Women’s _________ roles are care-givers and homemakers. (nature) 14. Wage _____________ had a negative effect on women. (discriminate) 15. Brenda and other female firefighters faced ____________ and even ___________ when working at the New York City Fire Department. (lonely/ violent) IV. Mark the letter A, B, C, or D to indicate the words/phrases that are CLOSEST in meaning to the underlined words/phrases. 1. In Vietnam, people often choose a favorable day for their important occasions. A. beautiful B. suitable C. favourite D. fair weathered 2. When do you intend to tie the knot with your Japanese girl? A. break up B. fall in love C. get married D. get together 3. After the wedding ceremony, there is usually a reception for the guests. A. proposal ceremony B. engagement ceremony C. formal party D. festival 4. How are governments addressing the problem of inequality in wages? A. solving B. raising C. creating D. ignoring 5. In most American families, parents have less influence on their children than those in other parts of the world. A. power B. effect C. attention D. care 6. Those people who have enough courage and will are likely to be successful. A. energy B. motivation C. bravery D. desire 7. There have been significant changes in women's lives since the women's liberation movement. A. controlled B. economic C. important D. natural 8. Many people applied for that job and eventually she was chosen in preference to the others. A. rather than B. other than C. more than D. less than

. Cho hình chóp S.ABCD có đáy là hình bình hành tâm O. Các mặt bên (SAB) và (SCD) vuông tại A và C và cùng hợp với đáy một góc a , hỏi rằng SO có chắc chắn vuông góc với (ABCD) không? Mình cần really gấp huhu

Giải giúp 10 bài này hộ em !!! Gấp lắm ạ

4/Giải thích a/Là một axit nhunge HF có thể tác dụng với SiO2 b/ HF là một axit yếu trong khi đó các axit HX(HCl,HBr,HI) là những axit mạnh c/ Dẫn khí Cl2 dư lần lượt vào dung dịch NaCl, KI có hồ tinh bột, NaBr(Thay Cl2 bằng Br2)