Tìm x biết
a, 1 2/3x – 4/3 = 1/5 ,
b, 2 mũ x-1 = 16
c, (x-1) mũ 2 = 25
d, 2 2/3:x = 1 7/9 : 2 2/3
e, (2x-5) mũ 3 = 1/27
Tìm x biết
a, 1 2/3x – 4/3 = 1/5 ,
b, 2 mũ x-1 = 16
c, (x-1) mũ 2 = 25
d, 2 2/3:x = 1 7/9 : 2 2/3
e, (2x-5) mũ 3 = 1/27
k chép lại đề :))
b, 2^x-1=2^4
⇒x-1=4
⇒x=5
Vậy x= 5
a,$\frac{5}{3}$x= $\frac{1}{5 }$ +$\frac{4}{3}$
$\frac{5}{3}$x=$\frac{23}{15}$
x=$\frac{23}{5}$ :$\frac{5}{3}$
⇒x=$\frac{23}{25}$
c,(x-1)^2=$5^{2}$
⇒x-1=5
⇒x=6
d, $\frac{8}{3}$ :$\frac{8}{3}$ =$\frac{16}{9}$ 😡
⇒x:$\frac{16}{9}$ =1
x=1.$\frac{16}{9}$ ‘
⇒x=$\frac{16}{9}$
e,(2x-5)^3=($\frac{1}{3}$)^3
⇒2x-5=$\frac{1}{3}$
⇒2x=$\frac{16}{3}$
⇒x=$\frac{8}{3}$