2.( 1) is not negative, so it is positive and zero. a≥0
(2)c & gt; A and c>b
(3)x+ 17 & lt; 5x
1.( 1)3x+8 & gt; 5x
(2)x^2≥0
(3) y represents the area of ocean, x represents the area of land, y >;; x
(4) Let the teacher's age be Y and your age be X, y & gt2x.
(5) Let football quality be A and basketball quality be B, then A >;; b
2. 1+3, 1+5, 1+7,3+5
3. Practical background, examples of daily life
For example, the mass of 1 hot water kettle and 1 cup is less than or equal to 5 kg.
2 wooden chairs plus 1kg is greater than or equal to 3kg.