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thaythaolq
2 năm trước
Bài 1: Cho m < n, hãy so sánh a/ 3m và 3n ; b/ 2m và m + n; c/ - m và – n ; d/ - 3m và - 3n . Bài 2 : Cho a < b, chứng tỏ a/ 3a – 4 < 3b – 4; b/ -2a -5 > -2b – 5; c/ 2a -3 < 2b + 5; d/ 3 – 5a > 1 -5b. Bài 3: So sánh a và b biết: a/ a + 4 < b +4 ; b/ - 4a > - 4b ; c/ 5a - 6 ≥ 5b – 6; d/ -3a + 4 ≤ -3b +4 . Bài 4: a/ Cho m > 0 và m < 1. Chứng minh m2 < m. b/ Cho a > b. Chứng minh 2( 1 – a ) < 2 ( 1 – b).
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