问题 解答题
已知5x2-3x-5=0,则5x2+2x-8-
5
5x2-2x-5
=______.
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.

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