2x十4x(8一x)=24
x十2x(8一x)=12
x+16x-2x²=12
2x²-17x=-12
x²-17x/2=-6
x²-17x/2+(17/4)²=289/16-96/16
(x-17/4)²=193/16
x-17/4=±√193/4
x=17/4±√193/4
x=(17±√193)/4
2x+4×(8-x)=24
2x+32-4x=24
2x-4x=24-32
-2x=-8
x=4
2x十4x(8一x)=24
2x十32一4x=24
2x=8
x=4
2x+32x-4x²=24
2x²-17x+12=0