a) 35x+8=33
<=> 5x+8=3
<=>5x=3-8=-5
<=>x=-1
b) 28-x=25
<=> 8-x=5
<=> x=8-5=3
\(3^{5x+8}=27\)
\(3^{5x+8}=3^3\)
\(5x+8=3\)
\(5x=-5\)
\(x=-1\)
\(2^{8-x}=32\)
\(2^{8-x}=2^5\)
\(8-x=5\)
\(x=3\)
=.= hok tốt!!
a) 35x+8 = 27
=> 35x+8 = 33
=> 5x + 8 = 3
=> 5x = 3 - 8
=> 5x = -5
=> x = -5 : 5
=> x = -1
b) 28-x = 32
=> 28-x = 25
=> 8 - x = 5
=> x = 8 - 5
=> x = 3
a) 35x+8 = 27 35x+8 = 33 Suy ra: 5x + 8 = 3 5x = 11 x = 11 : 5 x = 2,2