你的题目不太完整,你看是哪种情况吧
1.6×2x=9解: 3.2x=93.2x÷3.2=9÷3.2x=2.8125
1.6×2x=9,3.2x=9,x=9÷3.2,x≈2.81
1.6x+2x=9解:(1.6+2)x=9 3.6x=9 x=9÷3.6 x=90/36 x=15/6 x=2.5