D

Ủa đề đâu bn, hay ăn quả báo cáo

\(\left(x-5\right)+16=9\)

\(\left(x-5\right)=19-16\)

\(\left(x-5\right)=3\)

\(x=3+5\)

\(x=8\)

A ( chắc vậy)

\(58=2.29\)

D

\(3.4^{2x+1}-156=72:2\)

\(3.4^{2x+1}-156=36\)

\(4^{2x+1}-156=36:3\)

\(4^{2x+1}-156=12\)

\(4^{2x+1}=12+156\)

\(4^{2x+1}=168\)

\(2x+1=168:4\)

\(2x+1=42\)

\(x+1=42:2\)

\(x+1=21\)

\(x=21-1\)

\(x=20\)

Lỗi

A

C