问题
解答题
已知5x2-3x-5=0,则5x2+2x-8-
|
答案
由于5x2-3x-5=0,则5x2=3x+5;
5x2+2x-8-
,5 5x2-2x-5
=3x+5+2x-8-
,5 3x+5-2x-5
=5x-3-
,5 x
=
,5x2-3x-5 x
=0.
故答案为:0.
已知5x2-3x-5=0,则5x2+2x-8-
|
由于5x2-3x-5=0,则5x2=3x+5;
5x2+2x-8-
,5 5x2-2x-5
=3x+5+2x-8-
,5 3x+5-2x-5
=5x-3-
,5 x
=
,5x2-3x-5 x
=0.
故答案为:0.