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A Math Problem about "One-dimensional Linear Inequality Group" (the second semester of Shenzhen Junior Two in Beijing Normal University) (the range of values)
(1) solving equations, x=-3+a, y=-4-2a.
X is a non-positive number and y is a negative number.
So x < =0, y<0.
So-3+a
-4-2a & lt； 0
sulphur dioxide
(2)a-3 & lt； =0
So when 2
When-2 < a <; 2. The original formula =3-a+(2-a)=5-2a.