问题
解答题
(1)计算:
(2)解方程:(x-3)2+4x(x-3)=0. |
答案
(1)原式=
÷6
+5
+2 3 6 2
=
+56
+2 3 2
=
+56(
-3
)2 (
+3
)(2
-3
)2 2
=6
-63
+52 2
=6
-3
.2
(2)(x-3)2+4x(x-3)=0
(x-3)(x-3+4x)=0,
x-3=0,x-3+4x=0,
x1=3,x2=
.3 5