a)(x-15)-75=0
=>x-15=75
=>x=90
Vậy x=90
b)2x-3=11
=>2x=14
=>x=7
Vậy x=7
c)(2+x):5=6
=>2+x=30
=>x=28
Vậy x=28
d)2+x:5=6
=>x:5=4
=>x=20
Vậy x=20
e)(x-15).15=0
=>x-15=0
=>x=15
Vậy x=15
f)32(x-10)=32
=>x-10=1
=>x=11
Vậy x=11
g)x-105:21=15
=>x-5=15
h)(x-105):21=15
=>x-105=5/7
=>x=5/7+105
=>x=5/7+735/7
=>x=740/7
Vậy x=740/7
TH1:k)x.3=27
=>x=27:3
=>x=9
Vậy x=9
TH2:k)x^3=27
=>x^3=3^3
=>x=3
Vậy x=3
k)x.3=27
