Trả lời câu hỏi 2 Bài 6 trang 18 SGK Toán 8 Tập 1

Tìm \(x\) sao cho \(3{x^2} - 6x = 0\)

Lời giải

\(\eqalign{
& 3{x^2} - 6x = 0 \cr
& 3x.x - 2.3x = 0 \cr
& 3x\left( {x - 2} \right) = 0 \cr
& \Rightarrow \left[ \matrix{
3x = 0 \hfill \cr
x - 2 = 0 \hfill \cr} \right. \Rightarrow \left[ \matrix{
x = 0 \hfill \cr
x = 2 \hfill \cr} \right. \cr} \)


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