20x-x^2=24
问题描述:
20x-x^2=24
答
20x-x^2=24
x^2-20x+24=0
x^2-20x+100-100+24=0
(x-10)^2-76=0
(x-10-2√19)(x-10+2√19)=0
x=10+2√19或x=10+2√19