若(2x+3y+1)²与4x+y-3的绝对值互为相反数,则(xy)的101次方是多少
问题描述:
若(2x+3y+1)²与4x+y-3的绝对值互为相反数,则(xy)的101次方是多少
答
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答
∵(2x+3y+1)²与|4x+y-3|互为相反数∴﹙2x+3y+1﹚²+|4x+y+3|=0∵﹙2x+3y+1﹚²≥0|4x+y+3|≥0∴﹙2x+3y+1﹚²=0|4x+y+3|=0∴2x+3y+1=0 ①4x+y-3=0 ②解得;x=1 y=﹣1∴xy...