图片太模糊了,第1、第2题只能就题目的形式跟你讲一下方法,然后自己做:
依次将各选项中的点的坐标代入函数关系式中检验,哪个满足关系相等,哪个点就在函数图像上;似乎你的函数是y=-6/x,C选项是(-1,6)的话,那就是C了.(猜的)
图片看不清,就大致估计了一下几个数字,如果不对,你自己可仿照这个方法计算:
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/86d6277f9e2f070862c4d426ea24b899a801f2d7?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
题中BC=8,是吗?下面就按这个数计算了:⑴△ABD∽△DCB,理由:∵AD∥BC,∴∠ADB=∠DBC,又∠DAB=∠BDC=90°,∴△ABD∽△DCB.
⑵由△ABD∽△DCB得 AD:DB=DB:BC,∴DB^2=AD*BC=2*8=16,DB=4
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/c75c10385343fbf226765f05b37eca8065388fba?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)