$2x²=x+1$
$⇒2x²-x-1=0$
⇒$(x-1)(x+1/2)=0$
⇒\(\left[ \begin{array}{l}x=1\\x=-1/2\end{array} \right.\)
$↔2x²-x-1=0$
$↔2x²-2x+x-1=0$
$↔2x(x-1)+(x-1)=0$
$↔(2x+1)(x-1)=0$
$↔2x+1=0\quad or\quad x-1=0$
$↔x=-\dfrac{1}{2}\quad or\quad x=1$
, trình bày sự phân hóa khí hậu Bắc Mĩ và giải thích nguyên nhân
giúp em với lần cuối ạ : 100 công 43 nhân 7 chia 2 rồi nhân 65 là bằng ? ạ
Các bạn giúp mình giải bài tập này nha. Lưu ý phải giải thích từng bước giải thì mình với có thể vote cho 5 sao và câu trả lời hay nhất nhé. Câu 3: Tìm Số Nguyên x, Biết: a) |x+2|= 5 b) |x+3|= 15 c) |x–7|+13= 25 d)|x–3|–16 = –4
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