Question

40-2x=18

3x+1=27

3x-5=25

Answer 1

trình bảy ra hết nhé đừng làm tắt

Answer 2

\(40-2x=18\\ 2x=40-18\\ 2x=22\\ x=22:2\\ x=11\)

 

Answer 3

\(40-2x=18\\ \Leftrightarrow2x=40-18\\ \Leftrightarrow2x=22\\ \Leftrightarrow x=22:2\\ \Leftrightarrow x=11\)

\(3x+1=27\\ \Leftrightarrow3x=27-1\\ \Leftrightarrow3x=26\\ \Leftrightarrow x=\dfrac{26}{3}\)

\(3x-5=25\\ \Leftrightarrow3x=25+5\\ \Leftrightarrow3x=30\\ \Leftrightarrow x=30:3\\ \Leftrightarrow x=10\)

Answer 4

⇔2x=40-18

⇔2x=22

⇔x=22:2

⇔x=11

 

⇔3x=27-1

⇔3x=26

⇔x=26:3

⇔8,666...

 

⇔3x=25+5

⇔3x=30

⇔x=30:3

⇔x=10