已知5x2-3x-5=0,则5x2+2x-8-55x2-2x-5=______.-数学

题目简介

已知5x2-3x-5=0,则5x2+2x-8-55x2-2x-5=______.-数学

题目详情

已知5x2-3x-5=0,则5x2+2x-8-
5
5x2-2x-5
=______.
题型:解答题难度:中档来源:不详

答案

由于5x2-3x-5=0,则5x2=3x+5;
5x2+2x-8-class="stub"5
5x2-2x-5

=3x+5+2x-8-class="stub"5
3x+5-2x-5

=5x-3-class="stub"5
x

=
5x2-3x-5
x

=0.
故答案为:0.

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