口算小博士．×= ÷2= 80%﹣20%= 4×25%+16×25%=×= ×72%= ×÷= ×÷×=
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×=
×
= 
÷2= 80%﹣20%= 4×25%+16×25%=
= 
×72%= 
×
÷
= 
×
÷
+
= 3
+1.75=
÷
=
×
=
×
=
﹣
=
+
=
×0+3=
+
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=
×
÷
×
﹣
=
+
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﹣
= 2÷
=
×6=
÷
=
×6=
×
=
﹣
÷
=
÷
=
×
=
×
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=
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= 6.4÷0.08= 4﹣2.92=
÷
=
=
×
=
÷2÷
+
= 15÷
= 35×
=
×
÷
=
﹣
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= 12×
= 1÷
=
=
= 1.6×4×0.25= 0÷
=
+
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÷6=
×
= 2﹣
+
=
×16= 6﹣
=
÷
=5×
÷5×
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