口算．120÷6 30×10 3000÷5 300÷3 12×30505÷5 960÷3 69÷3 2000÷4 550÷590×50 53×20
直接写出得数．= 80%= 1÷10%= 74×4×25%=×15%=
直接写出得数×24=÷= 25××= 5.8×9+5.8=+= 5÷5÷=÷÷×= 1÷2.5%=
直接写得数．×=÷= 1﹣= 0.13=（+）×8=﹣=+=×= 0÷=÷3×÷3=
用递等式计算．．
直接写出得数+= 1÷=×=÷9= （﹣0.5）÷=÷=×=÷10=﹣=÷×=
=
= 1÷10%= 74×4×25%=
×15%=
×24=
÷
= 25×
×
= 5.8×9+5.8=
+
= 5÷5÷
=
÷
÷
×
= 1÷2.5%=
×
=
÷
= 1﹣
=
+
）×8=
﹣
=
+
=
×
= 0÷
=
÷3×
．
+
= 1÷
=
×
=
÷9=
﹣0.5）÷
=
÷
=
×
=
÷10=
﹣
=
÷
×
=
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