解方程-1/2x²+2x=0,(3a-4)²=25
问题描述:
解方程-1/2x²+2x=0,(3a-4)²=25
答
-1/2x²+2x=0,
x²-4x=0
x(x-4)=0
x=0或x=4
(3a-4)²=25
(3a-4+5)(3a-4-5)=0
(3a+1)(3a-9)=0
a=-1/3或a=3