4：5= （填小数）=0.8： ．
==== ÷16．
2= = = ÷ ．
= ÷10=．
2=== ÷ ．
× =+ = ÷= ：5= ×0.35=1．
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=
=
=
= ÷16．
=
=
= ÷ ．
= ÷10=
．
=
=
= ÷ ．
× =
+ = ÷
= ：5= ×0.35=1．