Đáp án:
a) \(\left[ \begin{array}{l}x=0\\x=10\end{array} \right.\)
b) \(\left[ \begin{array}{l}x=2\\x=4\end{array} \right.\)
Giải thích các bước giải:
bài 4
a) $7x.(x-10) = 0$
⇔ \(\left[ \begin{array}{l}7x = 0\\x- 10=0\end{array} \right.\)
⇔ \(\left[ \begin{array}{l}x=0\\x=10\end{array} \right.\)
b) $17(3x-6).(2x-8) = 0$
⇔ $(3x-6)(2x-8) = 0$
⇔ \(\left[ \begin{array}{l}3x - 6=0\\2x - 8=0\end{array} \right.\)
⇔ \(\left[ \begin{array}{l}x=2\\x=4\end{array} \right.\)
