Giúp mình vs,thanks ạ

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Giúp mình vs,thanks ạ

Question

Giúp mình vs,thanks ạ
giup-minh-vs-thanks-a

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Môn Toán Dulcie 4 years 2020-10-19T14:15:22+00:00 2020-10-19T14:15:22+00:00 2 Answers 67 views 0

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Captcha* Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )

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Nho · Answer 1 · 2020-10-19T14:16:57+00:00

Nho

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2020-10-19T14:16:57+00:00 October 19, 2020 at 2:16 pm

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Bài 1:

a) `x/4=5/2`

`⇒ 2x=4.5=20`

`⇒ x=10`

b) `(1/2)/x =(3/4)/(2/3)`

`⇒ 3/4x=1/2 .2/3`

`⇒ 3/4x=1/3`

`⇒ x=4/9`

c) `x/2=8/x`

`⇒ x²=8.2=16`

`⇒ x=±4`

Bài 2:

`-3/12=-30/120`

`(-3)/(-30)=12/120`

`120/12=(-30)/(-3)`

`120/(-30)=12/(-3)`

Helga · Answer 2 · 2020-10-19T14:17:08+00:00

Bạn tham khảo!
Bài 1
$a)$ $\frac{x}{4}$ $=$ $\frac{5}{2}$
$\to$ $x$ $.$ $2$ $=$ $4$ $.$ $5$
$\to$ $x$ $.$ $2$ $=$ $20$
$\to$ $x$ $=$ $20$ $:$ $2$
$\to$ $x$ $=$ $10$
$b)$ $1 / 2 / x$ $=$ $3 / 4 / 2 / 3$
$\to$ $\frac{0.5}{x}$ $=$ $\frac{0.75}{0.67}$
$\to$ $x$ $.$ $0.75$ $=$ $0.5$ $.$ $0.67$
$\to$ $x$ $.$ $0.75$ $=$ $\frac{67}{200}$
$\to$ $x$ $=$ $\frac{67}{200}$ $:$ $0.75$
$\to$ $x$ $=$ $\frac{67}{150}$
$c)$ $\frac{x}{2}$ $=$ $\frac{8}{x}$
$\to$ $x$ $.$ $x$ $=$ $2$ $.$ $8$
$\to$ $2 x$ $=$ $16$
$\to$ $x$ $=$ $16$ $:$ $2$
$\to$ $x$ $=$ $4$ và $x$ $=$ $- 4$
Bài 2
$- 3$ $.$ $420$ $=$ $12$ $.$ $- 30$
$\to$ $\frac{- 3}{12}$ $=$ $\frac{420}{- 30}$
$\to$ $\frac{12}{- 3}$ $=$ $\frac{- 30}{420}$
$\to$ $\frac{12}{- 30}$ $=$ $\frac{- 3}{420}$
$\to$ $\frac{- 30}{12}$ $=$ $\frac{420}{- 3}$
$F b B i n h n e 2 k 88$

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