\(\frac23x=\frac12x-\frac34\)
Tìm x
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\(x^2-x-\frac{3}{4}=0\)
\(\Rightarrow x^2+\frac{1}{2}x-\frac{3}{2}x-\frac{3}{4}=0\)
\(\Rightarrow x\left(x+\frac{1}{2}\right)-\frac{3}{2}\left(x+\frac{1}{2}\right)=0\)
\(\Rightarrow\left(x-\frac{3}{2}\right)\left(x+\frac{1}{2}\right)=0\)
\(\Rightarrow\hept{\begin{cases}x-\frac{3}{2}=0\\x+\frac{1}{2}=0\end{cases}\Rightarrow\hept{\begin{cases}x=\frac{3}{2}\\x=-\frac{1}{2}\end{cases}}}\)
Chúc bạn học tốt.
nhưng mà mình chỉ biết thế thôi thiếu gì thì bổ sung, còn làm dc thì làm luôn nha đung mình k
\(x^2-x-\frac{3}{4}=0\)
\(\Rightarrow\frac{x^2-x}{1}-\frac{3}{4}=0\)
\(\Rightarrow\frac{\left(x^2-x\right).4}{4}-\frac{3}{4}=0\)
\(\Rightarrow\frac{4x^2-4x-3}{4}=0\)
\(\Rightarrow4x^2-4x-3=0\)
\(\Rightarrow4x^2-6x+2x-3=0\)
\(\Rightarrow2x\left(2x-3\right)+\left(2x-3\right)=0\)
\(\Rightarrow\left(2x+1\right)\left(2x-3\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2x+1=0\\2x-3=0\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{-1}{2}\\x=\frac{3}{2}\end{cases}}}\)
\(\left(\dfrac{3}{4}+\dfrac{1}{2}\right)\times\dfrac{4}{5}:2\)
\(=\left(\dfrac{3}{4}+\dfrac{2}{4}\right)\times\dfrac{4}{5}\times\dfrac{1}{2}\)
\(=\dfrac{5}{4}\times\dfrac{4}{5}\times\dfrac{1}{2}\)
\(=1\times\dfrac{1}{2}=\dfrac{1}{2}\)
1. how / animal / fast / the / is / fastest /? how fast is the fastest animal?
2. didn’t / to / yesterday / I / go / school. I didn't go to school yesterday
3. old / Uncle Ho / died / how / when / he / was /? how old was uncle ho when he died?
4. learning / in / they / the / classroom / are. they are learning in the classroom
Bµi 6 : S¾p xÕp l¹i c¸c tõ, côm tõ ®· cho thµnh c©u hoµn chØnh( 1 ®iÓm)
1. wide / your / is / room / how / ? /
How wide is your room?
2. thicker / is / this / than / book / one / that /.
This book is thicker than that one
3. you / in / usually/ what / do / do / summer / ? /
What do you usually do in summer?
4. you / what / matter / the / is / with / ?/
What is the matter with you?
Gọi tuổi em là x
Tuổi anh hiện nay là x+8
Theo đề, ta có:
\(x+8-5=\dfrac{3}{4}\left(x+8\right)\)
\(\Leftrightarrow x+3-\dfrac{3}{4}x-6=0\)
=>1/4x-3=0
hay x=12
Vậy: EM 12 tuổi, ANh 20 tuổi
23x=12x−34
Bây giờ chúng ta sẽ giải phương trình này để tìm \(x\):
\(23 x - 12 x = - 34\) \(11 x = - 34\)
\(x = \frac{- 34}{11}\)
Vậy giá trị của \(x\) là:
\(x = \frac{- 34}{11}\)
h này bn vẫn chx ngủ à????
\(\dfrac{2}{3}x=\dfrac{1}{2}x-\dfrac{3}{4}\)
\(\dfrac{2}{3}x-\dfrac{1}{2}x=-\dfrac{3}{4}\)
\(\left(\dfrac{2}{3}-\dfrac{1}{2}\right).x=-\dfrac{3}{4}\)
\(\dfrac{1}{6}x=-\dfrac{3}{4}\)
\(x=-\dfrac{3}{4}:\dfrac{1}{6}\)
\(x=-\dfrac{9}{2}\)