Toán Câu cuối mình quên còn bài nữa 2x^2+3x-5=0 08/09/2021 By Aaliyah Câu cuối mình quên còn bài nữa 2x^2+3x-5=0
2x^2+3x-5=0 2x^2+5x-2x-5=0 (2x^2+5x)-(2x+5)=0 x(2x+5)-(2x+5)=0 (x-1)(2x+5)=0 <=>x-1=0 2x+5=0 <=>x=1 2x=-5 <=>x=1 x=-5/2 Trả lời
2x² + 3x – 5 = 0 ⇔ 2x² – 2x + 5x – 5 = 0 ⇔ (2x² – 2x) + (5x – 5) = 0 ⇔ 2x(x – 1) + 5(x – 1) = 0 ⇔ (x – 1)(2x + 5) = 0 ⇔ $\left \{ {{x-1=0} \atop {2x+5=0}} \right.$ ⇔ $\left \{ {{x=1} \atop {x=\frac{-5}{2}}} \right.$ Trả lời
2x^2+3x-5=0
2x^2+5x-2x-5=0
(2x^2+5x)-(2x+5)=0
x(2x+5)-(2x+5)=0
(x-1)(2x+5)=0
<=>x-1=0
2x+5=0
<=>x=1
2x=-5
<=>x=1
x=-5/2
2x² + 3x – 5 = 0
⇔ 2x² – 2x + 5x – 5 = 0
⇔ (2x² – 2x) + (5x – 5) = 0
⇔ 2x(x – 1) + 5(x – 1) = 0
⇔ (x – 1)(2x + 5) = 0
⇔ $\left \{ {{x-1=0} \atop {2x+5=0}} \right.$
⇔ $\left \{ {{x=1} \atop {x=\frac{-5}{2}}} \right.$