Tìm x biết : /2x-1/=3
Th1 : | 2x - 1 | = 3
2x = 4
x = 2
Th2 : : /2x-1/=-3
2x - 1 = -2
x = -1
k nha
1) /2x-1/ tương đương 2x-1=3 hoặc -3
th1) 2x-1=3
suy ra 2x=4
x=2
th2) 2x-1=-3
suy ra 2x=-2
x=-1
2) (4/5)^5 \(\times\)x= (4/5)^7
\(\Leftrightarrow\)x = (4/5)^7 \(\div\)(4/5)^5
\(\Leftrightarrow\)x=(4/5)^2=16/25