64.2x-2=22020
26.2x:22=22020
26.2x =22020.22
26.2x =22022
2x =22022:26
2x =22018
21+3.\(|\)x\(|\)=3.(42-1)
21+3.\(|\)x\(|\)=3.15
21+3.\(|\)x\(|\)=45
3.\(|\)x\(|\)=45-21
3.\(|\)x\(|\)=24
\(|\)x\(|\)=24:3
\(|\)x\(|\)=8
\(|\)x\(|\)=\(|\)8;-8\(|\)
=>x\(\in\){8;-8}
Chúc bn học tốt
a) 64.2x-2=22020
26.2x-2=22020
2x-2=22020:26
2x-2=22014
\(\Rightarrow\)x-2=2014
x=2014+2
x=2016
Vậy x=2016.
b) 21+3.|x|=3(42-1)
21+3|x|=3(16-1)
21+3|x|=3.15
21+3|x|=45
3|x|=45-21
3|x|=24
|x|=24:3
|x|=8
\(\Rightarrow\)x=8 hoặc x=-8
Vậy x=8 hoặc x=-8.