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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
0.5×2.4= × ÷ =
×8.4= ÷2= ÷ = × = 2.4÷10%=
× = 1÷ = ÷40%= ÷15= ÷ =
60÷40%= 3∶0.6= =
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