Đáp án:
Giải thích các bước Dkxd:x≠41112x+111x−4+10x−49=20x+1718⇒18.(12x+1)+2.(10x−4).(11x−4)18(11x−4)=(20x+17)(11x−4)18(11x−4)⇒216x+18+2.(110x2−84x+16)=220x2−80x+187x−68⇒216x+18+220x2−168x+32=220x2+107x−68⇒59x=118⇒x=2(tmdk)Vậyx=2:
Dkxd:x≠41112x+111x−4+10x−49=20x+1718⇒18.(12x+1)+2.(10x−4).(11x−4)18(11x−4)=(20x+17)(11x−4)18(11x−4)⇒216x+18+2.(110x2−84x+16)=220x2−80x+187x−68⇒216x+18+220x2−168x+32=220x2+107x−68⇒59x=118⇒x=2(tmdk)Vậyx=2