无
*注意事项:
÷2 = 4÷ = 1- = 1÷ + =
+ = ÷0.4 = × = ×0÷ = × ÷ × =
①2.4:1.6=12:x
②x:10=15:12
③6:x= :
④ :x=
⑤ =
⑥ =3.5:7
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