解决一个问题用英语可以说“solve a problem”。
来源：solve是英语动词，意思是“解决”。problem 是名词，意思是“问题”。
例句：
We need to solve this problem as soon as possible. (我们需要尽快解决这个问题。)
The team is working hard to solve the technical problems. (团队正在努力解决技术问题。)
Can you help me solve this math problem? (你能帮我解决这道数学题吗？)