学数学要会举一反三,不能只背公式。Xué shùxué yào huì jǔyīfǎnsān, bù néng zhǐ bèi gōngshì.To learn maths you must be able to draw inferences from one example, not just memorise formulas.
这个孩子很聪明,老师教一遍他就能举一反三。Zhège háizi hěn cōngming, lǎoshī jiāo yí biàn tā jiù néng jǔyīfǎnsān.This child is very clever; after the teacher explains once, he can work out the rest.
做完这道题,你要试着举一反三,找出类似的问题。Zuòwán zhè dào tí, nǐ yào shìzhe jǔyīfǎnsān, zhǎochū lèisì de wèntí.After finishing this problem, try to apply it more widely and find similar problems.