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Hướng dẫn làm bài:
a)
b) Vẽ đường thẳng AN cắt đường thẳng a tại S.
Khi đường thẳng ABN song song với đường thẳng a thì không vẽ được điểm S, vì hai đường thẳng song song thì không có điểm chung. Em có thể tham khảo hình sau:
a)
b) Vẽ đường thẳng AN cắt đường thẳng a tại S.
Khi đường thẳng ABN song song với đường thẳng a thì không vẽ được điểm S, vì hai đường thẳng song song thì không có điểm chung. Em có thể tham khảo hình sau:
câu a vẽ hình mà
câu b k vì AN không cắt đường thẳng a nên k xác đubgh đc điểm S để cko S,A,N thẳng hang`
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