• 1. (2019五下·沛县月考) 解方程．

  ①1+0.2x＝2.4

  ②2x÷3＝6

  ③7.8x+3.2x＝12.1

  ④7x﹣0.9×3＝3.6

  ⑤2x+2.5﹣7.8＝2.7

  ⑥18.5﹣2x＝8.5