卡西欧计算器解一元三次方程的方法如下:
准备材料:卡西欧计算器fx-991cCNX
1、第一步,按下开机按钮,然后找到设置/菜单键,如下图所示。
![](https://iknow-pic.cdn.bcebos.com/faf2b2119313b07ecdb02a681cd7912397dd8c44?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、第二步,进入菜单选项页面,找到第八个功能--方程/函数,如下图所示。
![](https://iknow-pic.cdn.bcebos.com/342ac65c10385343f8c2fd418313b07eca808844?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、第三步,选择1--联立方程,如下图所示。
![](https://iknow-pic.cdn.bcebos.com/3b87e950352ac65c11081c13ebf2b21193138a44?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
4、第四步,然后选择未知数个数为3,如下图所示。
![](https://iknow-pic.cdn.bcebos.com/5243fbf2b2119313b64e85d075380cd791238d44?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、第五步,进入数据输入页面,如下图所示。
![](https://iknow-pic.cdn.bcebos.com/c75c10385343fbf2b621dc43a07eca8065388f44?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
6、第六步,输入数据,方法是输入对应的数字再按等号。全部输入完毕后再按等号得到结果,如下图所示。
![](https://iknow-pic.cdn.bcebos.com/e850352ac65c10385173b4a2a2119313b07e8944?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
7、例如方程组8x-3y-z=9-3x+3y-2z=7-z-2y+5z=-12,返回结果x=1,y=2,z=-1。
![](https://iknow-pic.cdn.bcebos.com/11385343fbf2b2119623ff2eda8065380cd78e44?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)