Bài 9:
a) $x^{2}$ = 16
⇒ x= ±4
b) $x^{3}$ = 27
⇒ x=3
c) $2x^{3}$ -4= 12
$2x^{3}$ = 16
$2x^{3}$ = 8
x= 2
d) $5x^{3}$ -5=0
$5x^{3}$ =5
$x^{3}$ =1
x=1
e) $(x+1)^{2}$ =16
x+1=4
x=3
g) $(x+1)^{3}$ =27
x-1=3
x=4
h) $(x-1)^{3}$ =27
x-1=3
x=4
i) $(2x-1)^{3}$ =125
2x-1=5
2x=6
x=3
Bài 10:
a) $(2x-1)^{3}$ =27
2x-1=3
2x=4
x=2
b) $(2x+1)^{3}$ =125
2x+1=5
2x=4
x=2
c) $(x+2)^{3}$ = $(2x)^{3}$
x+2=2x
-x=-2
x=2
d) $(2x-1)^{7}$ = $x^{7}$
2x-1=x
x-1=0
x=1
Chúc học tốt!!! Mong bn cho ctlhn 😊❤🙆
