a) $7x+21=0$
$7x=-21$
$x=-3$
b) $5x-2=0$
$5x=2$
$x=\frac{2}{5}$
c) $-2x+28=0$
$-2x=-38$
$x=14$
d) $0,25x+1,5=0$
$0,25=-1,5$
$x=-6$
e) $6,2-3,1x=0$
$3,1x=6,2$
$x=2$
f) $2x+x+12=0$
$3x=-12$
$x=-4$
g) $5x-2x-24=0$
$3x=24$
$x=8$
h) $x-5=3-x$
$2x=8$
$x=4$
a)
`7x+21=0`
`7x = -21`
`x = -21/7`
`x = -3`
b)
`5x-2=0`
`5x = 2`
`x = 2/5`
c)
`-2x+28=0`
`-2x = -28`
`x = -28/-2`
`x = 14`
d)
`0,25x+1,5=0`
`0,25x = -1,5`
`x = (-1,5)/(0,25)`
`x = -6`
e)
`6,2-3,1x=0`
`3,1x = 6,2`
`x = (6,2)/(3,1)`
`x = 2`
f)
`2x+x+12=0`
`3x + 12 = 0`
`3x = -12`
`x = -12/3`
`x = -4`
g)
`5x-2x-24=0`
`3x - 24 = 0`
`3x = 24`
`x = 24/3`
`x = 8`
h)
`x-5=3-x`
`x + x = 5 +3`
`2x = 8`
`x = 8/2`
`x = 4`
hình bình hành có tổng cạnh đáy và chiều cao là 230cm, chiều cao kém cạnh đáy 24cm. tính diện thích hình bình hành đó
Hoàn thành câu với các từ gợi ý giúp em với ạ
Bỏ dấu ngoặc rồi tính a.-15+(89+15-72)-(89-72) b.50-(47+50-18)+(47-18) c.50-(45-30+54)-30+5
Chọn đáp án thôi mn ơi giúp em với
VII. Read the following passage and choose the best answer Making a film takes a long time and is very hard work. Writing the story for the film may take many weeks. Filming the story, or shooting the film, often takes at least six months. Actors and cameramen work from very early in the morning until late at night. Each scene has to be acted and re-acted, filmed and re-filmed, until it is just fine. Sometimes the same scene has to be acted many times. The film studio is like a large factory, and the indoor stages are very big indeed. Scenery of all kinds is made in the studio. Churches, houses, and forests are all built of wood and cardboard. Several hundred people work together to make one film. Some of these people are the actors and actresses. The director of the film, however, is the most important person in a film studio. He decides how the scenes should be filmed and how the actors should act. Most people go to see a film because they know the film stars are in it. Sometimes the film may be very poor. It is best to choose a film made by a good director. Some famous directors make their films very real; people feel that they themselves are among the people in the films. 6. Which of the following statements is NOT true? A. Writing the story for the film is a part of making a film. B. The indoor stages in the film studio are very big. C. All of the people in film making are actors and actresses. D. Shooting the film often takes many months. 7. The best title for the passage is "________ ". A. Writing the Story B. Actors and Actresses C. A Director D. Making a Film
Mọi người làm giúp mình bài này nha
Mn ai biết câu trả lời giúp em với
giúp mình với mình đang vộiiiiiiiiiiiiiiiii
Cho 1,92g kim loại M hóa trị II tác dụng vừa đủ với dung dịch HCl ,sau phản ứng thu được 7,6g muối. Xác định tên kim loại M ?
giúp mik với mng ơi ngày mai hết hạn rùi ạ 30đ
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến