直接写出得数．73﹣37= 38+45= 81﹣5= 720﹣400=46+30= 340+470= 6+59= 270﹣90=
口算：×3= ，×2= ，×= ，×= ，÷4= ，÷= ，÷= ，÷= ．
直接写出得数． 15×=6= 0.52= 30：= 3.2+0.68= 6×÷6×=
直接写得数×15=×2=×=×=×= 1×=×=×34=×=×=×=×=÷10=÷= 0÷=÷4= 1÷= 22÷=÷=÷0.4=
直接写出得数．×25=÷6= 0.54+O.46= 9﹣= （）×30== 177+99= 3÷7== 0.9×99+0.9=
×16=×=﹣=×= 6÷=÷=÷4=÷=+=﹣= 100×= 8×= 1÷=﹣= 12÷= 0×=
×3= ，
×2= ，
×
= ，
×
= ，
÷4= ，
÷
= ，
÷
÷
= ．
=
6= 0.52=
= 3.2+0.68= 6×
÷6×
×15=
×2=
×
=
×
=
×
=
=
×
=
×34=
×
=
×
=
×
=
×
=
÷
= 0÷
=
÷4= 1÷
= 22÷
=
÷
÷0.4=
×25=
÷6= 0.54+O.46= 9﹣
=
）×30=
= 177+99= 3÷7=
= 0.9×99+0.9=
×16=
×
=
﹣
=
×
=
=
÷
=
÷4=
÷
=
+
=
﹣
= 100×
= 8×
=
﹣
= 12÷
= 0×
=
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