(1)设长为5x米,宽为3x米则 2(5x + 3x) = 1928x = 96x = 12长 = 5x = 60 米宽 = 3x = 36 米面积 S = 长×宽 = 60×36 = 2160 平方米(2)设顶角度数是 2x° ,则底角度数是 3x°2x + 3x + 3x = 1808x = 180x = 22.5顶角 ...