1.Tìm x€N sao cho: (2n+3) là ước của 10. 2.Chứng tỏ rằng với mọi số tự nhiên n thì tích (n+3) (n+6) chia hết cho 2. 3.Trong các số 0;1;87;73;1657;547 số nào là số nguyên tố,số nào là hợp số. 4.Cho I thuộc đoạn thẳng CD,K thuộc đoạn thẳng CI.Biết CD=7cm,DI=3cm,CK=2cm.Tính CI,KI. Mọi người giúp mik vs ạ

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