250x - 2(x+50)(x+0.5)

题目

250x - 2(x+50)(x+0.5)
求x

答案

250x - 2(x+50)(x+0.5)=0
250x - 2（x² + 0.5x +50x +25）=0
250x -2x² -x -100x -50 =0
2x² -149x +50 =0
用求根公式可解