|2x+3| \ 5=6\7 3x+6\2=6\9 \là phần nha mn 12/08/2021 Bởi Skylar |2x+3| \ 5=6\7 3x+6\2=6\9 \là phần nha mn
Đáp án: + ) \(\left[ \begin{array}{l}x=9/14\\x=-51/14\end{array} \right.\) + ) x = $\frac{-7}{9}$ Giải thích các bước giải: + ) $\frac{|2x+3|}{5}$ = $\frac{6}{7}$ |2x+3| = $\frac{6}{7}$ . 5 |2x+3| = $\frac{30}{7}$ → \(\left[ \begin{array}{l}2x+3=30/7\\2x+3=-30/7\end{array} \right.\) → \(\left[ \begin{array}{l}2x=30/7-3\\2x=-30/7-3\end{array} \right.\) → \(\left[ \begin{array}{l}2x=9/7\\2x=-51/7\end{array} \right.\) → \(\left[ \begin{array}{l}x=9/7:2\\x=-51/7:2\end{array} \right.\) → \(\left[ \begin{array}{l}x=9/14\\x=-51/14\end{array} \right.\) + ) 3x + $\frac{6}{2}$ = $\frac{6}{9}$ 3x = $\frac{6}{9}$ – $\frac{6}{2}$ 3x = $\frac{-7}{3}$ x = $\frac{-7}{3}$ : 3 x = $\frac{-7}{9}$ Bình luận
(2x+3)/5=6/7 => 7(2x+3)/35=30/35 => 7(2x+3)=30 => 2x+3=30/7 => x= 9/14 3x+6/2=6/9 => 27x+54/18=12/18 => 27x+54=12 => 27x=-42 => x= -14/9 Bình luận
Đáp án: + ) \(\left[ \begin{array}{l}x=9/14\\x=-51/14\end{array} \right.\)
+ ) x = $\frac{-7}{9}$
Giải thích các bước giải:
+ ) $\frac{|2x+3|}{5}$ = $\frac{6}{7}$
|2x+3| = $\frac{6}{7}$ . 5
|2x+3| = $\frac{30}{7}$
→ \(\left[ \begin{array}{l}2x+3=30/7\\2x+3=-30/7\end{array} \right.\)
→ \(\left[ \begin{array}{l}2x=30/7-3\\2x=-30/7-3\end{array} \right.\)
→ \(\left[ \begin{array}{l}2x=9/7\\2x=-51/7\end{array} \right.\)
→ \(\left[ \begin{array}{l}x=9/7:2\\x=-51/7:2\end{array} \right.\)
→ \(\left[ \begin{array}{l}x=9/14\\x=-51/14\end{array} \right.\)
+ ) 3x + $\frac{6}{2}$ = $\frac{6}{9}$
3x = $\frac{6}{9}$ – $\frac{6}{2}$
3x = $\frac{-7}{3}$
x = $\frac{-7}{3}$ : 3
x = $\frac{-7}{9}$
(2x+3)/5=6/7
=> 7(2x+3)/35=30/35 => 7(2x+3)=30 => 2x+3=30/7
=> x= 9/14
3x+6/2=6/9 => 27x+54/18=12/18
=> 27x+54=12 => 27x=-42 => x= -14/9