设每支铅笔 x 元,小亚带了 6 x - 1 元. 4 x + 2.8 = 6 x - 1 2.8 + 1 = 6 x - 4 x 3.8 = 2 xx = 3.8 ÷ 2x = 1.9小亚带了：6 x - 1 = 6 × 1.9 - 1 = 11.4 -...