弄清楚，弄明白：指通过思考、研究等方式来理解或解决问题。
找到答案，解决：指通过努力、思考等方式找到答案或解决问题。
figure out // [ figuring figured figures ]
动词词组 If you figure out a solution to a problem or the reason for something, you succeed in solving it or understanding it. 想出; 弄明白
It took them about one month to figure out how to start the equipment.
他们用了大约一个月的时间才弄明白如何启动这台设备。
They're trying to figure out the politics of this whole situation.
他们正试图弄明白整个形势的利害关系。
find the solution to (a problem or question) or understand the meaning of
同义词： solve / work out / puzzle out / lick / work
计算出
合计
这四个选项中，只有figure out（计算出）和数字有关系。
figure out: 想出；理解，明白 Betelgeuse 爱上OK124 n.【天】参宿四，猎户座α：位于猎户星座的一颗鲜红色固有变星，距地球572光年 .
也可表示职位、地点、 figure out(好好地思考以)理解……；计算出；合计起来；想出 figure in把…
We could figure out the pronoun problem.
我们可以解决这个代词问题。
"It is very simple to figure out," answered the Fox.
“这很好理解。”狐狸回答说。
I can't figure out how to do this.
我弄不懂怎样做这件事。
"After many years of trying to figure out what is going on with the genetic cause of depression, we're still not there yet."
VOA : special.2009.06.24
So, what we do as our seventh step is then figure out if we have any extra valence electrons left at all.
那么，第七步要做的是看看,我们还有没有剩下的价电子。
化学原理课程节选 : 麻省理工公开课
That didn't work. Well they couldn't figure out what was wrong. And they spent a long time trying to debug the program.
调试这个程序,那时候当然不叫调试了,然后他们发现了问题。
计算机科学及编程导论课程节选 : 麻省理工公开课
And I know how long a piece they want. Then I daydream a lot, trying to figure out what might be interesting for that group to do."
VOA : special.2010.07.12
"One of the programming problems was try to figure out how to break an arbitrary chocolate bar into a certain number of pieces of a certain number of sizes and to do it as quickly as possible.
VOA : special.2010.03.11
Eventually, someone will figure out that this is just the tip of a virtual iceberg.
She spent her days in the lab, trying to figure out how to genetically engineer plants.
The medical students in turn have to figure out how to treat the patient.