Đáp án: CÂU 2 NHA BẠN IUUUUUUUUK
a)12−2.|x|=−2a)12−2.|x|=−2
=>2|x|=12−(−2)=>2|x|=12−(−2)
=>2|x|=14=>2|x|=14
=>|x|=7=>|x|=7
=>x=7=>x=7 hoặc x=−7x=−7
b)|2x−3|:(−3)+1=−2b)|2x−3|:(−3)+1=−2
=>|2x−3|:(−3)=−3=>|2x−3|:(−3)=−3
=>|2x−3|=9=>|2x−3|=9
=>2x−3=9=>2x−3=9 hoặc 2x−3=−92x−3=−9
=>2x=12=>2x=12 hoặc 2x=−62x=−6
=>2x=6=>2x=6 hoặc x=−3x=−3
c)24+(−4).|5−2x|=20c)24+(−4).|5−2x|=20
=>(−4)|5−2x|=−4=>(−4)|5−2x|=−4
=>|5−2x|=1=>|5−2x|=1
=>5−2x=1=>5−2x=1 hoặc 5−2x=−15−2x=−1
=>2x=4=>2x=4 hoặc 2x=62x=6
=>x=2=>x=2 hoặc x=3x=3
d)5.(x+4)+2.(3−x)=−2²d)5.(x+4)+2.(3−x)=−2²
=>5x+20+6−2x+4=0=>5x+20+6−2x+4=0
=>3x+30=0=>3x+30=0
=>3x=−30=>3x=−30
=>x=−10=>x=−10
