Bài làm:
Ta có: \(42.5-\left(3x+6\right)=3^4\)
\(\Leftrightarrow210-3x-6=81\)
\(\Leftrightarrow3x=123\)
\(\Rightarrow x=41\)
\(42.5-\left(3x+6\right)=\) \(3^4\)
\(\Leftrightarrow\)\(210-\left(3x+6\right)=81\)
\(\Leftrightarrow\)\(3x+6=210-81\)
\(\Leftrightarrow\)\(3x+6=129\)
\(\Leftrightarrow\)\(3x=129-6\)
\(\Leftrightarrow\)\(3x=123\)
\(\Leftrightarrow\)\(x=41\)
42.5-(3x+6)=3^4
42.5-(3x+6)=81
210-(3x+6)=81
(3x+6)=210-81
(3x+6)=129
3x=129-6
3x=123
x=123:3
x=41
vậy x=41
\(42.5-\left(3x+6\right)=3^4\)
\(210-\left(3x+6\right)=81\)
\(3x+6=210-81\)
\(3x+6=129\)
\(3x=129-6\)
\(3x=123\)
\(x=123:3\)
\(x=61\)
Vậy x=61
Chúc Bạn Hok Tốt l
Mk chia nhầm 41 nha bạn
42.5-(3x+6)=3^4
42.5-(3x+6)=81
210-(3x+6)=81
(3x+6)=210-81
(3x+6)=129
3x=129-6
3x=123
x=123:3
x=41
vậy x=41
42.5-( 3x+6)=3⁴
\(\Leftrightarrow\) 210 - 3x - 6 = 81
\(\Rightarrow\) 3x = 123
\(\Rightarrow\) x = 41
Làm ngắn gọn thôi . Nếu bạn không hiểu thì có thể hỏi :)))
Cái này lớp 6 học chưa nhỉ??
