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Known - 6
(2a+b)min=2(a)min+(b)min=-12+2=-10
(2a+b)max=2(a)max+(b)max=16+3=19
-10≤2a+b≤19
（a-b)max=(a)max-(b)min=8-2=6
.min=(a)min-(b)max=-6-3=-9
-9≤a-B≤6
（a/b)min=（a)min÷（b)min=-6÷2=-3
（a/b)max=（a)max÷（b)min=8÷2=4
-3≤a/b≤4
It is known that the length of two sides of trapezoid is 6 and 8 respectively, and the length of one waist is 7, then the value range of the other waist length a is 0______ ．
It is known that ad = 6, BC = 8, ab = 7, DC = a, make de ‖ ab ∫ ad ‖ BC, de ‖ ab ∫ quadrilateral, adeb is parallelogram, ad = be = 6, de = AB = 7 ∫ EC = BC-AD = 2 in △ Dec: de + EC > DC, i.e. a < 9de-ec < DC, i.e. a > 5 ∫ another waist length, a, is 5 < a < 9
In △ ABC, a = 6, B = 8, then the value range of perimeter P is______ ．
According to the trilateral relationship of the triangle, if the third side is greater than 2 and less than 14, the perimeter is greater than 16 and less than 28
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