解方程①50x-x²=616②3k+2/k=-7(请讲明步骤)
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/11 02:18:44
解方程①50x-x²=616②3k+2/k=-7(请讲明步骤)
解方程①50x-x²=616②3k+2/k=-7(请讲明步骤)
解方程①50x-x²=616②3k+2/k=-7(请讲明步骤)
①50x-x²=616
x²-50x+616=0
x²-50x+625=9
(x-25)²=9
x-25=±3
x=25±3
x1=28 x2=22
②3k+2/k=-7
3k²+2=-7k
3k²+7k+2=0
(3k+1)(k+2)=0
3k+1=0或k+2=0
k1=-1/3 k2=-2