( |x| . 2 + 3).4-8 = 20
( |x| . 2 + 3).4 = 20 + 8
|x| . 2 + 3 = 28 : 4
|x| . 2 = 7 - 3
|x| . 2 = 4
|x| = 4 : 2
|x| = 2
\(\Rightarrow\) x = 2 hoặc -2
Tim x biet : 20 . 2^x + 1 = 10.4^2 + 1
Tim x : ( 4-x:2)^3 - 1 = 2 . (2^3 - 5 : 2^0 )
Tim so nguyen x, biet: -2 . (-x - 5) + 28 = 20 - 3 . (x + 4)
Tim so nguyen x biet : -x/2+2x/3+x+1/4+2x+1/6=3/8
Tim x biet
2x + 3 =7
x^2 +4 =8
Tim cac so nguyen x, biet:
1. -10<x<-5
2. -4<hoac= x <hoac=3
3. n+9<x<hoac=n+12
4. n+15<x<n+15
5. x<-9 va x<9
6. |x|=|10|
7. |x|=20 va x>0
8. |x|=-100
9. |-5|+|-9|+x=14+|12|
10. 8+x=|-8|+20
tim x thuoc Z biet |x-2| - 5(x-4) = 20 - 5x
cau1tinh
a) A=4+ 2 mu 2 + 2 mu 3 +... +2 mu 20
b) tim x biet
(x+1) + (x+2) +...+(x+100)=5750
tim x biet
(-25)-(5.x-3)=4
5.x-6=20-(12-6)
-2.x-40=(5-x)-(-15+60)
Bai 1: Tim so nguyen x biet:
x+(x+1)+(x+2)+...+35=0
Bai 2: Tim GTLN:
a) 8-(x+2)^2=E
b) -|x+2|+10=F
Bai 3: Tim x \(\in\)Z:
a)(2x-4)(x+4)<0
b)(x+5)(3x-12)>0
Bai 11: Cho:
S=1-2+3-4+5-6+...+19-20
a) S co\(⋮\)2; 3; 5 khong?
b) Tim tat ca cac uoc cua S
chi tiet gi minh nha
