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huuminhvo1992
2 năm trước
Bài 1. Cho a < b. So sánh: a/ 2a và a + b b/ - 3a và - 3b c/ 2a và 2b Bài 2. Cho a < b. Chứng tỏ : a/ 2a – 3 < 2b – 3 b/ 3a + 1 < 3b + 1 Bài 3. a/ Cho m > n . Chứng minh : 2m – 3 > 2n - 4 b/ Cho a < b . Chứng minh: 2a - 3 < 2b + 5 giúp ạ
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