(1乘以2x+3)+(x乘以-x)=0 怎么算
问题描述:
(1乘以2x+3)+(x乘以-x)=0 怎么算
答
化简-x^2+2x+3=0
然后配方-(x^2-2x+1)+4=0
(x-1)=4
x-1=2或-2,解得x=3或-1