Tìm x biết (5x - 2)(2x + 1) + (10x + 3)(1 - x) = 13
Giải thích
Ta có: 5x−22x+1+10x+31−x=13
⇔5x2x+1−22x+1+10x1−x+31−x=13
⇔10x2+5x−4x−2+10x−10x2+3−3x=13
⇔8x=12⇔x=32
Ta có: 5x−22x+1+10x+31−x=13
⇔5x2x+1−22x+1+10x1−x+31−x=13
⇔10x2+5x−4x−2+10x−10x2+3−3x=13
⇔8x=12⇔x=32