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ken.libra2k1
2 năm trước
cho tam giác MNQ vuông tại M, cho MQ=3cm, MN=4cm a)Tính NQ. b) Gọi A là trung điểm MQ, I và F là hình chiếu của M và Q lên đường thẳng NA. chứng minh: tam giác MAI=tam giác QAF c) chứng minh: QN<2MA+MN. d) chứng minh: MN<NA+NF/2
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