= 1- = = =
= = = =
5000毫升=升 7升=毫升
3000毫升=升 8升=毫升
①53+x=89
②3x+5x=12.8
③2x-6.2=2.18
④5×1.4+4x=27
⑤7x-16×4=27
⑥2.8x-1.9x=13.5