If the lengths of the three sides of the triangle are 4, 1-2a and 7, then the value range of a is 0
From the triangle trilateral relation theorem, 7-4 < 1-2a < 7 + 4 is obtained, that is - 5 < a < - 1. The value range of a is - 5 < a < - 1
From the triangle trilateral relation theorem, 7-4 < 1-2a < 7 + 4 is obtained, that is - 5 < a < - 1. The value range of a is - 5 < a < - 1