$9(3x-2)=x(2-3x)$$⇔9(3x-2)-x(2-3x)=0$$⇔9(3x-2)+x(3x-2)=0$$⇔(9+x)(3x-2)=0$$+,9+x=0$$⇔x=-9$$+,3x-2=0$$⇔3x=2$$⇔x=\dfrac{2}{3}$Vậy `S={-9;\frac{2}{3}}`
`9(3x-2)=x(2-3x)`
`⇔ 27x - 18 = 2x - 3x^2`
`⇔ 2x - 3x^2 + 18 = 27x`
`⇔ -3x^2 - 25x + 18 = 0`
`⇔ -3x^2 + 2x - 27x + 18 = 0`
`⇔ -x(3x-2)-9(3x-2) = 0`
`⇔ -(3x-2)(x+9) = 0`
`1)` `3x - 2 = 0 ⇔ 3x = 2 ⇔ x = 2/3`
`2)` `x + 9 = 0 ⇔ x =-9`
Vậy `S = {-9,2/3}`
Nung 10(g) hh gồm MgCO3, CaCO3, Al2O3 cho đến khi khối lượng không đổi thấy thoát ra 2,1952 lít khí (đktc). Tính m chất rắn thu được spu? ^^ Cần gấp nha mn:)))
Viết calligrapphy chữ Cố Lên Yc:có đổ bóng,có đánh bóng trắng,tone xanh lá,vt đúng kiểu chữ calli Cố lên nhé mn ^^
vẽ đậu mầm NL: Tìm nhóm hộ đứa bạn link để dưới phần hỏi chi tiết
giúp mk với mn mk đang cần gấp :((
Exercise 4 : Rewrite the following sentences 1/ "You'd better do morning exercise, Minh", said I. I advised ............................................................................................................................. 2/ "I won't lend you any more money !", she said to me. She refused............................................................................................................................... 3/ "Don't hurry !", my mother said to me. My mother told......................................................................................................................... 4/ "Don't go too near the elephant !", his father said to him. His father warned him ............................................................................................................... 5/ "Keep silent !', the teacher said to his pupils. The teacher ordered ..................................................................................................................... 6/ "I think you'd better not go to work for a few days, Cathy". I advised ..................................................................................................................................... 7/ Finding a good job nowadays is difficult. It's ................................................................................................................................................ 8/ Lying in the sun is pleasant. It's ................................................................................................................................................ 9/ "Please don't tell anyone what happened.", Ann said to me. Ann told me ................................................................................................................................. 10/ "You'd better not lend her any money, John", said Jack. Jack advised ................................................................................................................................ 11/ " I won't let anyone know your address", she said to me. She promised ............................................................................................................................. 12/ "Don't forget to order the supplies I need". My boss reminded me. My boss reminded me...........................................................................................
Exercise 3 : 1/ The man spoke too fast for us to understand. The man didn't .................................................. 2/ She is very old so she can't dance beautifully. She is too ......................................................... 3/ Your writing is so small that I can't read it. Your writing ..................................................... 4/ To learn English is easy. It is ............................................................................................. 5 / They think speaking French is difficult. They think .............................................................. 6/ It isn't easy to start looking for a job at his age. Starting ......................................................... 7 / He is very old, so he can't apply for that job. He is too.......................................................... 8 / They ran too fast, so we couldn't catch them. They ran too ..................................................... 9 / She spoke too quickly for me to understand. She didn't .......................................................... 10 / Mrs Hoa was too weak to go to work yesterday. Mrs Hoa wasn't ...................................... 11/ It is too cold, so we can't go out. It is .............................................................................. 12/ He couldn't move the piano because it was too heavy. The piano was ............................ 13 / Mrs Hoa was the last person who came to visit him. Mrs Hoa........................................
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Viết Calligraphy chữ: Hèn.-. Yc:viết có tâm,vó đổ bóng Làm trừ nhiều điểm,ko giải thích ko nói j mà out nhóm lập tức thì đc gọi là gì .-.
Cho 20.1 gam hỗn hợp fe, Zn, Cuo phản ứng vừa đủ với 300ml dd HCl 2M, sau p.ứ thu đc 4,48 l khí h2 (ở đktc) a) viết các ptp.ứ xảy ra B) tính % theo m mỗi chất trong hh ban đầu
Cali : High Rise Invasion Yêu cầu : - Dùng app - Đẹp , có tâm Thanks
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