问题
解答题
解方程:(1)(y+2)2=9
(2)3(x-5)2=2(5-x).
答案
(1)(y+2)2=9,
y+2=3,y+2=-3,
y2=1,y2=-5.
(2)3(x-5)2=2(5-x),
3(x-5)2-2(5-x)=0,
3(x-5)2+2(x-5)=0,
(x-5)(3x-15+2)=0,
x-5=0,3x-15+2=0,
x1=5,x2=
.13 3
解方程:(1)(y+2)2=9
(2)3(x-5)2=2(5-x).
(1)(y+2)2=9,
y+2=3,y+2=-3,
y2=1,y2=-5.
(2)3(x-5)2=2(5-x),
3(x-5)2-2(5-x)=0,
3(x-5)2+2(x-5)=0,
(x-5)(3x-15+2)=0,
x-5=0,3x-15+2=0,
x1=5,x2=
.13 3