问题
解答题
(1)(
(2)2(x-3)=x2-9. |
答案
(1)原式=
×31 3
×23
-23
×26
-3
×26
=6-123
-62
=6-182
;2
(2)方程移项得:2(x-3)-(x+3)(x-3)=0,
分解因式得:(x-3)(2-x-3)=0,
可得x-3=0或2-x-3=0,
解得:x1=3,x2=-1.
(1)(
(2)2(x-3)=x2-9. |
(1)原式=
×31 3
×23
-23
×26
-3
×26
=6-123
-62
=6-182
;2
(2)方程移项得:2(x-3)-(x+3)(x-3)=0,
分解因式得:(x-3)(2-x-3)=0,
可得x-3=0或2-x-3=0,
解得:x1=3,x2=-1.