(2000x+1000)x+1000=1320怎么计算
问题描述:
(2000x+1000)x+1000=1320怎么计算
答
(2000x+1000)x+1000=1320
(2000x+1000)x=320
(200x+100)x=32
200x^2+100x-32=0
50x^2+25x-8=0
x=(-5+√89)/20或x=-(5+√89)/20