475+286= 9002﹣105= 175×4= 1042÷4=（验算）
直接写得数+= 3+1.75=÷=×=×=﹣=+=×0+3= （+）×=×÷×=
口算下面各题．﹣=+=﹣= 2÷=×6=÷=×6=×=﹣=÷=÷=×=×=÷=÷= 6.4÷0.08= 4﹣2.92=÷=
直接写得数： 1﹣=×=÷2÷= 2×80%=+= 15÷= 35×=×÷×=
直接写出得数．﹣=×= 12×= 1÷=== 1.6×4×0.25= 0÷=
直接写得数．+=÷6=×= 2﹣+=×16= 6﹣=÷=5×÷5×=
+
= 3
+1.75=
÷
=
×
=
×
=
﹣
=
+
=
×0+3=
+
）×
=
×
÷
×
﹣
=
+
=
﹣
= 2÷
=
×6=
÷
=
×6=
×
=
﹣
÷
=
÷
=
×
=
×
=
÷
=
÷
= 6.4÷0.08= 4﹣2.92=
÷
=
=
×
=
÷2÷
+
= 15÷
= 35×
=
×
÷
=
﹣
=
×
= 12×
= 1÷
=
=
= 1.6×4×0.25= 0÷
=
+
=
÷6=
×
= 2﹣
+
=
×16= 6﹣
=
÷
=5×
÷5×
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