a)I2x+1I-(-7)=13
I2x+1I+7=13
I2x+1I=13-7=6
2x+1=6 hay 2x+1=-6
2x=6-1 hay 2x=-6-1
2x=5 hay 2x=-7
x=5:2 hay x=-7:2
x=5/2 hay x=-7/2
b)10-2I1/2-xI=6
2I1/2-xI=10-6
2I1/2-xI=4
I1/2-xI=4:2
I1/2-xI=2
1/2-x=2 hay 1/2-x=-2
x=1/2-2 hay x=1/2+2
x=1/2-4/2 hay x=1/2+4/2
x=-3/2 hay x=5/2
c)I32-2.$x^{2}$I=0
=>32-2.$x^{2}$=0
Mà hai số giống nhau trừ nhau mới bằng 0
Vậy2.$x^{2}$=32
$x^{2}$=32:2
$x^{2}$=16
$x^{2}$=$4^{2}$ hay $x^{2}$=$(-4)^{2}$
=>x=4 hay x=-4
