“代数”造句

他中学时不擅长代数.
He was not good at algebra in middle school.

代数里, 符号X常用来表示未知数.
In algebra, the sign X usually denotes an unknown quantity.

他的同学们正在绞尽脑汁地演算初等代数题.
His classmates were labouring with elementary algebra.

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