cho a - b chia hết cho 5 . chứng tỏ rằng các biểu thức sau chia hết cho 5 : 1) a- 6b 2) 2a-7b 3) 26a -21b +2000 đúng mình vote 5 sao thank

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a) Hoàn thành các ý sau: - Văn bản nghị luận là ................................................................................................................................... .................................................................................................................................................................. ...................................................................................................................................................................... ......................................................................................................................................................................... ...................................................................................................................................................................... - Luận điểm là : ................................................................................................................................................ ...................................................................................................................................................................... ......................................................................................................................................................................... ...................................................................................................................................................................... ......................................................................................................................................................................... - Luận cứ là : ................................................................................................................................................ ...................................................................................................................................................................... ......................................................................................................................................................................... ...................................................................................................................................................................... ......................................................................................................................................................................... - Lập luận là : ................................................................................................................................................ ...................................................................................................................................................................... ......................................................................................................................................................................... ...................................................................................................................................................................... a) Tục ngữ là gì?