the boy is young ,but he can work________the difficult maths problem(填介词）

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theboyisyoung,buthecanwork________thedifficultmathsproblem(填介词）theboyisyoung,buthecanwork________the

the boy is young ,but he can work________the difficult maths problem(填介词）
the boy is young ,but he can work________the difficult maths problem(填介词）

the boy is young ,but he can work________the difficult maths problem(填介词）
填out,因为：work out算出；题意为这个男孩很年轻但是算不出这个简单的数学题

out
计算出，克服

out
work out 解决；算出