Giải pt: $\sqrt{4x+12}=$$\sqrt{9x+27}-5$

C=y(x^2-y^2)(x^2+y^2)-y(y^4-y^4)

1. Jennie smiled brightly ______ him, giving him butterflies in his stomach. A. at B. on C. over D. in 2. There is someone ______ the door. A. on B. at C. over D. in 3. Write it ______ the paper, ______ the top of the page. A. on - at B. in - at C. on - in D. in - on 4. Everybody, let’s have a toast ______ his success. A. in B. with C. to D. for 5. I usually go to my parents' house ______ Christmas. We eat turkey together ______ Christmas Eve. A. at - in B. in - on C. at - on D. in - in 6. Firework display is a common ways of celebration ______ Lunar New Year’s Eve ______ Vietnam. A. on - in B. at - in C. on - at D. in -in 7. Take the next road ______ the left, then you will arrive ______ a pharmacy. A. in - at B. to - in C. in - at D. on - at 8. There is a skyscraper ______ the city’s square and the amusement park. A. on B. between C. among D. from 9. Nathan is a good friend ______ mine. A. for B. of C. in D. to 10. There is a new shopping center opening ______ the corner of this street. A. from B. at C. on D. in 11. ______ the most part, his explanations are quite easy to understand. A. For B. In C. Through D. By

Làm hộ với 😏😏😏😏😏🙃🙃🙃🙃🙃🙃

cho a+b=x+y, a^2+b^2x=x^2+y^2. cmr: x^4+y^4=a^4+b^4

Nhanh giúp mình với . Đang cần gấp

giải thích chi tiết có ngay hay nhất

The play was so boring .... An saw it from beginning to

A=3x+2/x-3 và B=x2 + 3x -7/x+3 a.tìm x thuộc z để A alf số nguyên b.timd x thuộc z để B là số nguyên c.tìm x thuộc z để Avà B là số nguyên

Cần gấp nhanh nha mình vote 5 sao