dễ vãi shit

a) \(\frac{3}{7}-x=\frac{1}{4}-\left(-\frac{3}{-5}\right)\)

\(\Rightarrow\frac{3}{7}-x=\frac{1}{4}-\frac{3}{5}\)

\(\Rightarrow\frac{3}{7}-x=\frac{-7}{20}\)

\(\Rightarrow x=\frac{3}{7}-\left(\frac{-7}{20}\right)=\frac{3}{7}+\frac{7}{20}\)

\(\Rightarrow x=\frac{109}{140}\)

b) \(\frac{-21}{-13x}+\frac{1}{3}=\frac{-2}{-3}\)

\(\Rightarrow\frac{21}{13x}+\frac{1}{3}=\frac{2}{3}\)

\(\Rightarrow\frac{21}{13x}=\frac{2}{3}-\frac{1}{3}=\frac{1}{3}\)

\(\Rightarrow13x=\frac{3.21}{1}=63\Rightarrow x=\frac{63}{13}\)

a.\(\frac{3}{7}-x=\frac{1}{4}-\left(\frac{-3}{-5}\right)\)

\(\frac{3}{7}-x=\frac{1}{4}-\frac{3}{5}\)

\(\frac{3}{7}-x=\frac{-7}{20}\)

\(x=\frac{109}{140}\)

Vậy\(x=\frac{109}{140}\)

b.\(\frac{-21}{-13}x+\frac{1}{3}=\frac{-2}{-3}\)

\(\frac{21}{13}x+\frac{1}{3}=\frac{2}{3}\)

\(\frac{21}{13}x=\frac{1}{3}\)

\(x=\frac{13}{63}\)

Vậy\(x=\frac{13}{63}\)

a) 3x(x-2)-x+2=0

⇔3x(x-2)-(x-2)=0

⇔(3x-1)(x-2)=0

⇔3x-1=0⇔x=1/3

⇔x-2=0⇔x=2

past simple : quá khứ đơn

past perfect : quá khứ hoàn thành

past simple :quá khứ đơn

past perfect :quá khứ hoàn thành

Past simple động từ chia thành Ved(VII)  bạn nhé 
Past pefect động từ chia giống present perfect

You/swim

Past simple: You swam.

Past continuous: You was swimming.

Past perfect: You had swum.

Past Perfect continuous: You had been swimming.

Present simple: You swim.

Present continuous: You are swimming.

Present perfect: You have swum.

Present perfect continuous: You have been swimming.

Future simple: You will swim./ You are going to swim.

Future continuous: You will be swimming./ You are going to be swimming.

Future perfect: You will have swum./ You are going to have swum.

Future perfect continuous: You will have been swimming./ You are going to have been swimming.

Future in past simple: You would swim./ You was going to swim.

Future in past continuous: You would be swimming.

Future in past perfect: You would have swum.

Future in past perfect continuous: I dont know that we have this kind of tense 

_{^{Không quá đơn giản}}

Dịch :

Viết 5 câu sử dụng thì quá khứ đơn với cả dạng khẳng định và phủ định

@.@

Write 5 sentences using past simple verbs with both positive and negative sentences.

Viết 5 câu sử dụng động từ đơn giản trong quá khứ với cả hai câu tích cực và tiêu cực.

Câu này có nghiaw là: viết ra 5 câu sử dụng trong dạng quá khứ đơn vối cả hai câu tích cực và tiêu cực

chúc bn hk giỏi nha