①x:0.8=5:16
②15:x=8:
③3.5∶7=10∶x
④ =
⑤ : = :x
⑥(3.5-x):7=0.4:1.4
①120+180÷5×6
②9.43﹣(0.39+2.43)
③
④
⑤()×14+
⑥